A casino operator runs the website or app where you browse and play, while a...

https://tysonsinterestingperspectives.cloudhinter.com/posts/who-actually-animates-slot-symbols-the-artist-or-the-developer

A casino operator runs the website or app where you browse and play, while a slot provider makes the game itself. Provider names matter in a catalogue because they help you identify who created a slot and find other games from the same studio