Casino owners are already millionaires, but after releasing their tokens, they are aiming to become billionaires. 
Yes, you're right about that. We can only hope for a generous airdrop for the users of this forum. 
Basically, it's some sort of additional rakeback/cashback. We mine tokens by playing/wagering, and we can cash them out at any moment...
I wonder how other casinos exist without cashback in own token? Well, probably the easiest way is to give cashback in one of the cryptocurrencies integrated on the site (for example, bitcoin or solana).But, well, let's see what happens next. I don't mind, I'm just thinking...