A casino operator runs the site, manages player accounts and payments, and...

https://post-wiki.win/index.php/How_Do_I_Follow_a_Slot_Provider%E2%80%99s_New_Releases_Across_Different_Casinos%3F

A casino operator runs the site, manages player accounts and payments, and decides which games to list. A slot provider makes the game itself, including its features and rules