A casino operator runs the site and manages your account, while a slot provider...

https://rapid-wiki.win/index.php/Why_Do_Slot_Games_Load_Slowly_on_Some_Phones%3F

A casino operator runs the site and manages your account, while a slot provider makes the game. Provider names show who built each title and help you compare games in a catalogue. Visuals and sound may vary, but they do not change the game rules.