UK online casinos operate under tight rules set by the UK Gambling Commission,...

https://businessmodelanalyst.com/the-uk-online-casino-business-model-revenue-streams-regulation-and-competitive-dynamics/

UK online casinos operate under tight rules set by the UK Gambling Commission, ensuring fairness and player protection. One key rule is a minimum 96% return-to-player rate, meaning players get back most of their stakes over time