Some casinos still believe that not asking for KYC is cool, but it's actually not, I see casinos with no kyc as a red flag because you can't run your business this way without getting into trouble with regulators.
Casinos neglect identity check but little did they know that they can be fined for it, if fraud cases arise from your casino and it's been investigated, your business is going away soon or you pay up for fine. One, for failing to screen customers using the KYC process, two, for possible running of unregistered casino.
Do you think your casino can be regulated without the AML policy? The requirements says it's all, so is it possible that those casinos doing their no KYC stuffs are not even registered?
There are still legit gamblers who are not comfortable with giving away their KYC information to someone and its acceptable too cause data is the new gold so you can't simply go with the trust of a site that may exist only for a few years.
Casinos can't operate if they are from the region where KYC/AML policies has become mandatory so casinos were forced to implement this rule in the first place even if they are against it but that is the situation so they are trying to survive with what they have and so for doing great as a sector.
Still there are craze for very few trusted non-KYC casinos but most of them don't have any bonus system which most gamblers don't like so yes it's possible but they are on the verge of implementing the rule at any time.