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

https://edwinhmva443.theglensecret.com/why-do-some-uk-casinos-focus-on-withdrawal-speed-instead-of-bigger-bonuses

UK online casinos operate under tight rules set by the UK Gambling Commission. These include limits like a 96% minimum Return to Player (RTP) on slots, making sure games pay out fairly