UK and US slot rules differ in ways players may not notice. UKGC testing sets...

https://charlie-wiki.win/index.php/Why_does_regulation_force_casinos_to_publish_accurate_RTP%3F

UK and US slot rules differ in ways players may not notice. UKGC testing sets clear standards for online games, while US rules vary by state. New York, for example, allows online sports betting but not online casino play, shaping where slots are available