A casino operator runs the site where you browse and play, while a slot...

https://padlet.com/hidrahubaiodmyl/bookmarks-s0256ttnzskc8c96ualn/wish/R7dXadK1wwGjW6bl

A casino operator runs the site 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