A casino operator runs the site and manages player accounts. A slot provider...

https://wiki-square.win/index.php/Why_Do_Some_Providers_Reuse_the_Same_UI_Layout_Across_Games%3F

A casino operator runs the site and manages player accounts. A slot provider makes the game. Provider names show who built each title and help you compare catalogs. Visuals and sound may differ, but they do not change the game rules.