So the gambling sites that have survived until now are those that already have a new system and also large loyal users such as stake, roobet, 1xbit, primedice and betfury.
It doesn't necessarily have to be new gambling sites, letting hundreds and thousands of dollars sit on gambling sites poses a big risk because you are giving them liquidity, the moment you decide to withdraw them out may indirectly or directly make them broke and there could be a delay in your withdrawals when you want to move them to your personal wallets.
By the way, I see a list of some gambling sites in your comments, why did you include 1xbit despite the plenty threads of accusations that have been reported here, maybe you should check again.
Edit: It is obvious the answer lies in your campaign.
