A casino operator runs the site, manages accounts and payments, and lists...

https://city-wiki.win/index.php/Why_Do_Some_Slots_Hide_the_Instructions_in_Tiny_Menus%3F

A casino operator runs the site, manages accounts and payments, and lists games. A slot provider creates the game. Provider names show who made each title and help you compare catalogs. Visuals and sound do not change the game rules.