I am also sure that with ever-increasing crypto regulations worldwide (wait and see what happens when the Blackrock ETF is actually approved), casinos will no longer be able to avoid large-scale KYC. Some casinos such as Roobet, for example, no longer allow use without KYC.
Even if a casino decides against KYC for its customers, exchanges will have to take an even closer look in future at where their customers' BTC comes from. It could well be that BTCs from a casino without KYC will simply no longer be accepted for a deposit.
Most casinos have their licenses and they will have to follow stricter regulations like KYC requirements from governments. They have no choices if they don't want to close their casinos and customers have no choice if they don't want to leave those casinos and use new ones.
New casinos are risky because they can be run by a weak and even scam team. There is not enough time to know about reputation of a new casino and gamblers will have difficulty to find non-KYC casinos to use.