The UK’s Gambling Act 2005 and the UK Gambling Commission laid the foundation...

https://nova-wiki.win/index.php/What_Does_the_EU_Set_as_a_Baseline_for_Online_Gambling_Consumer_Protection%3F

The UK’s Gambling Act 2005 and the UK Gambling Commission laid the foundation for regulating online casinos with player protection in mind. A key feature is the requirement for operators to keep players' funds separate from business money