Casinos that issue their own tokens will get funding from token sales to develop their casinos bigger
I don't think they used those tokens to raise funding but in order to get those tokens you need to mine it via wagering. Thats whales wager alot during the opening of the casino because the mining difficulty is too low because if the level of difficulty increases the wager requirement also increases and the rewards decreases.
I think the casino issued the token to try to provide other benefits for its members so that members can indirectly get something valuable and sell it when the price of the token goes up. But casinos need to think thoroughly about their plans for issuing those tokens because if it is only for inside the casino and cannot be sold on the market, the members will also not be able to benefit from becoming an investor in that casino. But each casino must already have a plan if they want to launch their own token and surely, they will have everything ready before launching the token.