The release of their tokens automatically binds players to a particular casino and is even a kind of guarantee that the player will continue to play using these tokens. I think that the release of their tokens allows the casino to maintain the presence of players in the game for a long time.
And it is also an excellent advertising and promotion tool to attract new players.
This could be the case, especially if the casino guarantees they will get more benefits by holding the token or using it to play gambling. This is the main attraction of casinos that can attract big gamblers who use large amounts of money because they can get bonus tokens and other benefits if they hold the token.
Casinos must be able to maintain and even improve their casinos and grow to be bigger than before and that can be run well if they are serious about the project.