True KYC is still the said most reliable for them, while there are still some non KYC Casino with exception stating on their TOS when they can ask for KYC if need be and like you said when government require for it or other reasons like users creating more than one accounts for bonuses, which I still as a reason by which even if government doesn`t request KYC on Casino some will still opt for it.
When government still monitored casino, casino will still apply KYC to all of their members because they don't wants to have a problem if they don't apply it. They know their members doesn't like KYC but casino can't do anything so we as their members can choose what we will do. We can stay at the casino or leave the casino and search for non KYC casino.
But that will not easy as many online crypto casino now require KYC for their members. Maybe we will see some non KYC casino will start to apply KYC with strictly. Besides that, online casino still wants to runs their business so they must follow the government rules.
We should realizes that non KYC casino can asks KYC to their members anytime. So if you don't wants to gets any problem, you should be prepare for that. You must know how to deal that so you will not feels bad if someday, those online casino asks you to do KYC.