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.