UK online casinos operate under strict 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 strict rules set by the UK Gambling Commission, which means they must be transparent about game odds and payouts. For example, many games offer around a 96% return to player (RTP)