A casino operator runs the site and manages its catalogue. A slot provider...

https://milosuniquejournal.publishlane.com/posts/does-a-familiar-provider-name-guarantee-the-same-rules-in-every-game

A casino operator runs the site and manages its catalogue. A slot provider makes the game. Provider names show who built each title and help you compare games across sites. Visuals and sound can vary, but they do not change the game rules.