I'm sorry but I don't fully understand what you mean. Even if Cloudbet sends deposits to a cold wallet or another hot wallet, it can only do this after the funds have been received. So when the user sends his funds from the exchange, the exchange doesn't know yet that the funds will be transferred later to a known wallet belonging to a casino. From the exchange point of view, the address looks like any common wallet address when the user makes a withdrawal to his gambling account.
That's the thing, exchanges doesn't know right away that those addresses come from casinos that's why these punishments take a while before they're handed out to their users. (that's what happened from my experience)
My point is similar to what pilosopotasyo said, gambling transactions can be traced by exchanges but it takes time for them to confirm those transactions.