A casino operator runs the site, manages your account, and decides which games...

https://paxtonscoolchat.readspirex.com/posts/how-does-animation-work-in-a-slot-game-when-you-hit-spin

A casino operator runs the site, manages your account, and decides which games appear in its catalogue. A slot provider makes the game itself, including its features, rules, visuals, and sound