Mobile Casinos UK 2026: How Tax Rules Shape Bonuses and Apps

Mobile casino play in Britain runs on a tax structure most players never see, yet it decides what lands in your bonus balance. Since 1 April 2022, remote gambling operators licensed by the Gambling Commission have paid Remote Gaming Duty at 21% of gross gambling yield, up from 15% before that date. That single number shapes wagering requirements, bonus caps and which brands can afford to bid for your attention.

Offshore sites face a different arithmetic. They hold licences from jurisdictions such as Curaçao, Malta or Gibraltar, pay far less in duty, and pass some of that saving back as bigger headline offers. The trade-off sits in player protection, dispute routes and withdrawal friction. This page unpacks how the 21% duty, the 10% general betting duty, the 15% point of consumption tax on free plays and the 2% UK lottery duty feed into the mobile casino market, and which of the 100+ brands operating here handle it best.

Expect concrete numbers: 21% Remote Gaming Duty, 15% Point of Consumption tax on free bets and bonuses, a £2 maximum stake on online slots for under-25s from 2025, and the £5,000 monthly net loss threshold that triggers affordability checks under Gambling Commission rules. No filler, no hype, just how the money moves and what it means when you tap a bonus on your phone at 11pm.

How Does UK Gambling Tax Change Mobile Casino Bonuses?

Remote Gaming Duty is charged on gross gambling yield, meaning stakes minus winnings paid out, minus certain allowable deductions. At 21%, a licensed operator hands roughly £21 of every £100 it keeps to HMRC. That is before corporation tax, before payment processing, before affiliate commissions that commonly run 25% to 40% of net revenue in the first year of a player's lifetime.

Run the numbers on a typical £10 bonus. If the operator expects a 4% house edge on the qualifying slots, a £10 bonus with 35x wagering requires £350 in total stakes to clear. Expected operator margin on that turnover is roughly £14. Duty at 21% takes about £2.94.

Add the 15% Point of Consumption tax on the bonus value itself, £1.50, and the promotional cost of the bonus, £10, and the operator is looking at close to £14.44 in direct costs against £14 in expected margin. Thin. That is precisely why UK-licensed bonuses carry 30x to 65x wagering while offshore clones advertise 5x to 10x.

The maths explains the pattern. Offshore operators licensed in Curaçao or Malta pay negligible duty on UK-facing play, so a 10x wagering offer costs them a fraction of what it costs a licensed brand. The saving shows up in the headline. What it does not show up in is the ADR (alternative dispute resolution) scheme, the £85,000 maximum payout under the Gambling Commission's compensation rules, or the ability to escalate a complaint to the Commission itself.

What Is Remote Gaming Duty and Who Pays It?

Remote Gaming Duty is a 21% tax on the gross gambling yield of remote casino, bingo, poker and slot products offered to UK customers. It applies to any operator holding a Gambling Commission remote licence, regardless of where the company is headquartered. Payment is quarterly, and HMRC publishes receipts: £3.4 billion in remote gambling duty was collected across 2023-24, the largest single gambling tax line.

General Betting Duty sits at 10% for remote sports betting, while the Lottery Duty is 2% of gross proceeds from UK lotteries. Pool betting and society lotteries have their own schedules. For the mobile casino player, the practical effect is simple: the 21% remote rate is the heaviest burden in the sector, and it lands squarely on slots, live dealer and instant-win products that dominate smartphone traffic.

The tax is not paid on player deposits or withdrawals. It is levied on operator margin, which means a brand with tight margins on high-RTP games feels the pinch more than one pushing 92% RTP slots. A Pragmatic Play title at 96.5% RTP leaves the operator 3.5 points of gross yield; at 21% duty, that is 0.735 points to HMRC. Same title at 94% RTP leaves 6 points, of which 1.26 goes to duty. RTP choice is a tax decision as much as a product one.

Why Do Offshore Casinos Offer Bigger Bonuses?

Offshore operators licensed in Curaçao, Anjouan or the Kahnawake territories pay no UK Remote Gaming Duty on non-UK play and often no equivalent local tax at meaningful rates. Their cost of acquiring a UK player is lower on the tax line, so headline bonuses can be 200% to 500% matched, with wagering at 10x to 20x. The catch is that these sites are not covered by the Gambling Commission's licence conditions, and UK players have no statutory route to the ADR scheme if a withdrawal stalls.

That does not make every offshore brand predatory. Several run solid KYC, publish RTP certificates and pay within 24 hours. But the structural difference is real, and it is the single biggest reason a 500% bonus from an unlicensed site can coexist alongside a 100% up to £100 offer from a Commission-licensed brand. The 21% duty is baked into the licensed offer; it is absent from the offshore one.

Worth noting for 2026: the Commission has tightened its stance on unlicensed operators targeting UK customers, with ISP blocking orders now covering over 1,000 domains. Payment processors face their own pressure. The practical result is that offshore sites are harder to fund from a UK bank account, which pushes many players back to licensed brands where the bonus is smaller but the money is more likely to arrive.

Which Mobile Casinos Lead the UK Market in 2026?

Brand recognition and app quality still decide most sign-ups, but the tax structure quietly sorts the field. Operators with deep pockets and diversified revenue, such as Flutter (Paddy Power, Sky Bet, Betfair), Entain (Ladbrokes, Coral, bwin) and Evoke (William Hill, 888), absorb the 21% duty more easily than single-brand challengers. That lets them run sustained bonus programmes without slashing RTP or tightening wagering beyond market norms.

Numbers reflect publicly listed RTP ranges, standard welcome terms and app availability as of early 2026.

OperatorParent / LicenceTypical Welcome OfferWageringApp
bet365 casinobet365 Group / UKGC + Gibraltar100% up to £100 + 50 spins20xiOS + Android
William Hill casinoEvoke / UKGC100% up to £100 + 100 spins30xiOS + Android
Sky Bet casinoFlutter / UKGC£40 bonus on £10 deposit35xiOS + Android
Ladbrokes casinoEntain / UKGC£40 bonus on £10 deposit35xiOS + Android
Paddy Power casinoFlutter / UKGC£50 bonus on £10 deposit35xiOS + Android
Coral casinoEntain / UKGC£50 bonus on £10 deposit35xiOS + Android
Betfred casinoBetfred / UKGC100% up to £100 + 50 spins40xiOS + Android
Betfair casinoFlutter / UKGC50 free spins on £1030xiOS + Android
Betway casinoSuper Group / UKGC100% up to £10035xiOS + Android
32Red casinoKindred / UKGC150% up to £15035xiOS + Android
888 CasinoEvoke / UKGC100% up to £100 + 88 spins30xiOS + Android
LeoVegas casinoMGM / UKGC + Malta100% up to £100 + 50 spins35xiOS + Android
Unibet casinoKindred / UKGC + Malta100% up to £100 + 10 spins35xiOS + Android
MrQ casinoLindar Media / UKGCSpins on deposit, no wagering0x on spinsMobile browser
PlayOJO casinoSkillOnNet / UKGC50 free spins, no wagering0x on spinsiOS + Android

Two names stand out for a tax-driven reason. MrQ and PlayOJO both built their proposition around no-wagering offers, which is expensive under the 15% Point of Consumption tax on bonus value but cheap on player trust. They can run this model because their base games carry slightly lower RTP than some rivals, typically 94% to 95.5% on the headline slots, and because they avoid the affiliate-heavy acquisition cost that eats into a competitor's margin.

At the other end, bet365 and the Flutter brands lean on scale. bet365's mobile product processes a reported 1 million+ bets per day across sports and casino, and its in-house tech stack means the marginal cost of serving an extra player is low. That efficiency is what funds a 20x wagering offer, which is among the friendliest in the UK market.

Why Do Big Brands Offer Smaller Bonuses?

Scale cuts both ways. A brand like Sky Bet or Ladbrokes spends heavily on TV, shirt sponsorships and above-the-line advertising, with annual marketing budgets in the tens of millions. The 21% Remote Gaming Duty and 15% Point of Consumption tax on bonuses sit on top of that spend. A smaller headline bonus is the visible result: £40 or £50 on a £10 deposit instead of a 200% match.

What you get in return is reliability. Withdrawals from these brands typically clear within 1 to 24 hours, KYC is standardised, and the ADR route via IBAS or eCOGRA is available if something goes wrong. The Commission's 2024-25 enforcement data shows licensed operators paid over £40 million in regulatory settlements in a single year; the flip side is that the framework exists to force those payments.

Smaller bonuses also mean lower effective cost per acquisition. A £40 bonus at 35x wagering on a 96% RTP slot carries an expected player cost of roughly £56 in turnover to clear, with an operator margin of about £2.24 before duty. Duty at 21% takes £0.47. The economics are tight enough that any brand offering much more than a 100% match to a UK player is either absorbing a loss on acquisition or operating outside the licensed framework.

What Makes a Mobile Casino App Worth Installing?

App quality splits into three testable things: load time, game count and withdrawal speed. A decent UK mobile casino app opens a slot in under 3 seconds on 4G, hosts 500 to 3,000+ titles, and processes a verified withdrawal in under 24 hours. Anything slower and the browser version usually wins.

Game count matters less than game mix. A 2,000-title library dominated by Pragmatic Play, NetEnt, Microgaming, Play'n GO and Evolution covers about 90% of what UK players actually spin. Live dealer from Evolution or Playtech is the other half of the story; without it, a mobile product feels incomplete for anyone who plays more than slots.

Storage footprint is a practical filter. Native apps from bet365, William Hill and 888 run 150MB to 300MB. Progressive web apps from MrQ, PlayOJO and several bingo-first brands run under 5MB because they are essentially bookmarked sites. On a phone with 64GB of storage, that difference matters.

How Do Wagering Requirements Work on Mobile Slots?

A wagering requirement is the total amount you must stake before bonus-derived winnings become withdrawable. A 35x requirement on a £100 bonus means £3,500 in stakes. On mobile, where sessions are shorter and stake sizes smaller, that target is harder to hit than it looks. A player staking £0.50 per spin needs 7,000 spins to clear it, which at 4 spins per minute is close to 29 hours of play.

Game weighting complicates the picture. Slots usually count 100% toward wagering, live dealer 10% to 20%, table games 5% to 10%, and some high-RTP or jackpot titles are excluded entirely. That means a £100 bonus cleared on live roulette at 10% weighting effectively becomes a 350x requirement. The headline number is rarely the real number.

Time limits add another layer. Most UK bonuses expire in 7 to 30 days. A 30-day window on a 35x requirement means averaging about £117 in daily stakes to clear. Miss the deadline and the bonus and any winnings from it are removed. That is not a penalty clause in the fine print; it is the standard structure.

Wagering LevelTypical BrandsStakes to Clear £100 BonusEst. Hours at £0.50/spin
0x (no wagering)MrQ, PlayOJO£00
20xbet365£2,000~16.7
30xWilliam Hill, Betfair, 888£3,000~25
35xSky Bet, Ladbrokes, Paddy Power, Coral, LeoVegas, Unibet£3,500~29
40xBetfred£4,000~33
65xSome bingo-led brands£6,500~54

The 15% Point of Consumption tax on free plays and bonuses is why no-wagering offers are rare and why they tend to come with lower bonus values. A £10 no-wagering bonus costs the operator £10 in promotional value plus £1.50 in tax, and there is no wagering turnover to recoup it from. Only brands with strong base-game margins or a subscription-style model can sustain that.

Read the terms in this order: wagering multiplier, game weighting, maximum bet per spin (usually £5), maximum win cap (often £250 to £500 on free spins), and expiry. Those five numbers tell you more about a bonus than any headline percentage.

Are No-Wagering Bonuses Actually Better Value?

For most players, yes, but the gap is narrower than it looks. A £10 no-wagering bonus is worth roughly £10 in expected value minus the RTP cost of any play needed to withdraw it. A £100 bonus at 35x wagering on a 96% RTP slot has an expected player cost of £140 in turnover, which at 4% house edge is £5.60. So the £100 bonus is worth about £94.40 in expectation, before the maximum win cap and game weighting are applied.

Once caps and weighting enter the calculation, the picture shifts. If the £100 bonus carries a £500 maximum win and slots-only weighting, and you plan to play live dealer, the effective value collapses. A £10 no-wagering offer with no cap and no game restriction is cleaner, even if the headline number is smaller.

Tax policy drives the supply of both. The 15% Point of Consumption tax makes large no-wagering bonuses expensive, which is why MrQ and PlayOJO cap theirs at spins rather than cash. Spins carry a fixed cost per spin, typically 10p to 25p, and if they yield nothing the operator has paid the tax on a small notional value rather than a large bonus balance.

How Fast Do Mobile Casino Withdrawals Clear?

Withdrawal speed depends on the payment method, not the casino's marketing. eWallets such as PayPal, Skrill and Neteller clear in under 24 hours at most UK-licensed brands. Debit card withdrawals take 1 to 3 working days. Bank transfers run 1 to 5 working days. Paysafe and Trustly sit in between at 1 to 2 days.

KYC is the real bottleneck. UK-licensed operators must verify identity, address and source of funds before the first withdrawal, and under the Commission's rules they can request additional documentation at £2,000 in deposits or £5,000 in net losses in a 12-month period. A player who uploads documents at sign-up rather than at withdrawal typically gets paid 24 to 48 hours faster.

Offshore sites vary wildly. Some process in under an hour; others hold withdrawals for 5 to 10 working days with no regulatory deadline. The Commission requires licensed operators to complete withdrawals within a reasonable period, and its 2024 guidance pushed most brands toward a 24-hour target for eWallets. That accountability does not exist offshore.

What Are the Tax and Regulatory Rules Behind Mobile Casino Play?

Three regulators matter in the UK: the Gambling Commission for licensing and player protection, HMRC for duty collection, and the Advertising Standards Authority for marketing claims. Each imposes concrete rules that shape what a mobile casino can and cannot offer.

The Commission's licence conditions require operators to display the licence number, offer a self-exclusion facility via GAMSTOP, and participate in the multi-operator self-exclusion scheme. GAMSTOP covers over 400,000 registered users and blocks access across every licensed UK operator. Offshore sites are not part of it.

HMRC collects Remote Gaming Duty at 21%, General Betting Duty at 10% on remote sports, Pool Betting Duty at 15%, and Lottery Duty at 2%. The 2022 rise from 15% to 21% added roughly £600 million a year to operator costs, and the market has absorbed it through tighter bonuses, marginally lower RTP on some titles, and consolidation.

The ASA enforces rules on bonus advertising. Since 2022, offers must be clear, must state significant conditions, and cannot target under-18s or vulnerable groups. A 500% bonus headline with 65x wagering and a 7-day expiry is legal only if the terms are as prominent as the headline. Most licensed brands now comply; offshore advertisers often do not.

What Is the Legal Age for Mobile Casino Play in the UK?

The legal age for gambling on a mobile casino in the UK is 18. That applies to slots, live dealer, table games, bingo and sports betting. The National Lottery and some society lotteries allow play from 16, but no casino product does. Age verification is mandatory before a first deposit, and operators use credit reference and electoral roll data to confirm it.

Under-25s face an extra restriction on slots. From 2025, the maximum stake on online slots for players aged 18 to 24 is £2 per spin, while players 25 and over can stake up to £5 per spin. The rule followed the Commission's 2024 consultation and reflects evidence that younger players are more likely to chase losses at higher stakes.

Enforcement is real. Operators that fail age checks face licence reviews and financial penalties. In 2024-25, the Commission issued multiple six-figure settlements for age verification failures, including cases where a single underage player triggered a £1 million+ penalty after the operator failed to act on KYC flags.

How Does the Point of Consumption Tax Affect Free Spins?

The Point of Consumption tax, introduced in 2014, applies a 15% duty to free plays and bonuses offered to UK customers. If a casino gives away 50 free spins worth 20p each, the notional value is £10, and the duty is £1.50. That is charged whether the spins produce a win or not.

The practical effect is that free spins are a cost centre, not a marketing freebie. A brand offering 200 spins at 10p each is looking at £20 in notional value and £3 in duty, on top of the game licensing cost. That is why spin values have drifted down over the past five years and why many brands now issue 50 spins at 10p rather than 100 at 20p.

Cash bonuses carry the same 15% duty on face value. A £100 matched bonus costs the operator £15 in duty immediately, plus the £100 in promotional balance. If the player busts out before clearing wagering, the operator has still paid the £15. That asymmetry explains why bonus terms have tightened rather than loosened since 2022.

Are Offshore Mobile Casinos Legal for UK Players?

Playing at an offshore casino is not a criminal offence for a UK-based player. The offence sits with the operator: offering gambling services to UK customers without a Commission licence breaches the Gambling Act 2005, and the Commission can pursue blocking orders, payment processor restrictions and, in theory, prosecution. Over 1,000 domains have been blocked under these powers.

The practical risk to the player is contractual, not criminal. An offshore site has no obligation to follow UK rules on withdrawal times, complaint handling or self-exclusion. If it delays a payout or refuses a complaint, there is no ADR route and no Commission escalation. Your only recourse is the operator's own terms and, in rare cases, a foreign regulator with limited reach.

Some offshore operators hold legitimate licences from Malta or Gibraltar and maintain high standards voluntarily. Others hold Curaçao or Anjouan licences with minimal oversight. The licence jurisdiction is the single most useful signal. A Maltese or Gibraltar licence comes with real supervision; a Curaçao licence in 2026 is close to a registration certificate.

What Player Protection Rules Apply to Mobile Casinos?

UK-licensed mobile casinos must offer deposit limits, loss limits, session reminders, time-outs and self-exclusion. Deposit limits must take effect immediately or within 24 hours of a request to increase. Loss limits are calculated on net losses, not stakes. Session reminders are mandatory after 60 minutes of continuous play.

GAMSTOP is the national self-exclusion register. Registering is free, takes about 5 minutes, and blocks access to every Commission-licensed operator for a minimum of 6 months, extendable to 5 years. There is no equivalent offshore. The Commission also requires operators to conduct affordability checks at £5,000 in net losses within 12 months, and enhanced checks at £25,000.

Vulnerability rules tightened in 2024 and 2025. Operators must monitor for markers of harm such as late-night play, escalating stakes, failed deposit attempts and rapid deposit-and-withdraw patterns. When a marker is triggered, the operator must intervene, and the intervention must be recorded. Failing to act on markers has produced some of the largest regulatory settlements in the sector's history.

Which Mobile Casino Features Actually Matter to Players?

Feature lists are long and mostly noise. The ones that change the experience are payment methods, game providers, live dealer quality and bonus transparency. Everything else, from loyalty tiers to gamified missions, is secondary.

Payment method coverage is the sharpest practical filter. A mobile casino that supports PayPal, Apple Pay, Google Pay and debit card covers over 90% of UK player preferences. Cryptocurrency is available at some brands but remains a minority interest among UK players, partly because of the tax and KYC complexity it introduces.

Game provider mix decides whether the library feels fresh. Pragmatic Play and Hacksaw Gaming dominate new slot releases in 2026, while Evolution and Playtech lead live dealer. NetEnt and Microgaming remain the backbone of legacy titles. A mobile casino without Evolution live tables is missing the fastest-growing product category.

One underrated factor is the RTP disclosure. Since 2023, the Commission has required operators to make game RTP accessible, and most now publish it in the game info panel. A mobile casino that shows 96%+ RTP on its headline slots is telling you something about its margin strategy. One that quietly runs 92% versions is too.

Bonus transparency splits the market cleanly. A brand that lists wagering, weighting, max bet and expiry on the same page as the offer is doing what the ASA requires. A brand that buries those terms three clicks deep is testing the boundary. On mobile, where screen space is tight, the difference is easy to spot.

Do Mobile Casinos Pay Out Less Than Desktop?

No. RTP is set at the game level, not the device level. A Pragmatic Play slot running at 96.5% RTP returns the same percentage whether you play it on an iPhone, an Android tablet or a desktop browser. The game server does not know or care what device is rendering the reels.

What can differ is game selection. Some operators serve a slightly different lobby to mobile users, prioritising portrait-mode slots and instant-play titles. If that mobile lobby skews toward lower-RTP games, the effective return for a mobile-only player is lower, even though no individual game has been altered.

Check the RTP shown in the game info panel before you spin. If it says 94% and the desktop version says 96%, you are playing a different configuration. This is legal, disclosed, and worth knowing. The gap of 2 percentage points on a £1,000 turnover is £20 in expected loss.

How Many Mobile Casino Games Should a Good App Have?

500 is the floor for a serious UK mobile casino. Below that, the library feels thin within a month. 1,000 to 2,000 titles covers most player preferences across slots, live dealer, table games, bingo and instant wins. Above 3,000, the marginal value drops unless the operator has strong search and filtering.

Quality beats quantity at the top end. A 1,200-title library with full Pragmatic Play, NetEnt, Play'n GO, Hacksaw and Evolution coverage is more useful than a 4,000-title library where 60% is low-quality clone content. The Commission does not regulate game quality, so the filter is player reviews and provider reputation.

Live dealer deserves its own count. Evolution alone offers 500+ live tables across roulette, blackjack, baccarat, game shows and localised variants. A mobile casino with under 50 live tables is offering a token live product, not a real one. Check the live lobby size before committing.

Are Mobile Casino Bonuses Taxable in the UK?

No. Gambling winnings, including casino bonuses and free spin outcomes, are not subject to UK income tax or capital gains tax for the player. HMRC taxes the operator through Remote Gaming Duty and the Point of Consumption tax, not the player. This has been the position since betting duty was restructured in 2001.

The operator side is different. Bonus value is taxed at 15% under the Point of Consumption rules, which is why bonuses are treated as a cost, not a giveaway. A £100 bonus is a £115 commitment for the operator once duty is included. That single fact explains more about UK bonus terms than any marketing copy.

Professional gamblers can face income tax if HMRC determines their activity amounts to a trade, but this applies to betting syndicates and full-time sports traders, not to recreational mobile casino players. For anyone spinning slots on their phone, winnings are tax-free, full stop.

Frequently Asked Questions About Mobile Casinos

Which mobile casino has the best welcome bonus in the UK?

bet365's 100% up to £100 with 20x wagering is the strongest combination of headline value and low clearing requirement among licensed brands. MrQ and PlayOJO offer smaller no-wagering deals that suit players who dislike turnover targets. The best bonus depends on whether you value headline size or clearability more.

Are mobile casino apps safer than browser play?

Security is equivalent. Both run over TLS-encrypted connections, and both are subject to the same Commission rules on data handling and KYC. Native apps add biometric login, which reduces the risk of someone else accessing your account on a shared device. Browser play avoids the storage footprint and update cycle.

How do I self-exclude from mobile casinos?

Register with GAMSTOP at gamstop.co.uk. It is free, takes about 5 minutes, and blocks access to every Gambling Commission-licensed operator for a minimum of 6 months. You can also request a time-out or permanent closure directly from any operator, which must be actioned within 24 hours.

Can I play mobile casino games while abroad?

UK-licensed operators generally allow play from abroad, but geo-restrictions apply in some countries and the operator may block access from jurisdictions where online gambling is prohibited. Check the operator's terms before travelling. VPN use to bypass geo-blocks usually breaches the terms and can void winnings.

What is the maximum stake on mobile slots in the UK?

For players aged 25 and over, the maximum online slot stake is £5 per spin. For players aged 18 to 24, the cap is £2 per spin, introduced in 2025. These limits apply to slots only, not to live dealer or table games, which have no statutory stake cap.

Do mobile casinos use the same RTP as desktop?

Yes, for the same game. RTP is configured at the server level, so a slot running at 96.5% returns the same on mobile and desktop. The only way mobile play yields lower returns is if the mobile lobby surfaces different, lower-RTP game variants, which is legal if disclosed in the game info panel.

How long does a mobile casino withdrawal take?

eWallets such as PayPal, Skrill and Neteller clear in under 24 hours at most licensed brands. Debit cards take 1 to 3 working days, bank transfers 1 to 5 working days. Completing KYC at sign-up rather than at withdrawal typically saves 24 to 48 hours on the first payout.

Responsible Gambling and Where to Get Help

Mobile casino play should be entertainment, not income. The legal age for any UK casino product is 18. Deposit and loss limits, session reminders and time-outs are available at every licensed operator, and they are free to use. Set a monthly loss limit before you deposit, and stick to it.

GAMSTOP is the national self-exclusion register and blocks access across every Gambling Commission-licensed operator for a minimum of 6 months, extendable to 5 years. Registration is free at gamstop.co.uk. The National Gambling Helpline is available 24 hours a day on 0808 8020 133, offering confidential support from trained advisers.

Additional support comes from GamCare, which runs the helpline and provides counselling, and from BeGambleAware, which funds treatment and prevention services across the UK. If play stops feeling like a choice, use these services. The 21% duty and the 15% bonus tax exist because the sector carries real social cost, and player protection rules exist for the same reason. Use them without hesitation.

The tax structure behind UK mobile casinos is not a footnote to the product; it is the product's operating system. Remote Gaming Duty at 21%, Point of Consumption tax at 15% on bonuses, a £5 slot stake cap and a £2 cap for under-25s all shape what appears on your screen.

Offshore sites can dodge those costs and advertise accordingly, but they also dodge the protection framework that makes a UK licence worth something. Read the wagering, check the RTP, verify the licence, and treat any bonus larger than the market norm as a question rather than a gift.