The casino does not ask KYC at the time of registration is to avoid new users from running to another casino because it is already faced with choices that are not liked because KYC is not something that players like even though this is no longer avoided.
And asking KYC when withdrawal of course there is a reason usually when the casino detects suspicious activities, but the reason is still unpleasant for the players and I have experienced this sometimes, and when asking the reason it was said because it detected suspicious things even though I only did normal, and What is more unpleasant sometimes casinos cannot answer the real reasons from the necessity of KYC to withdraw funds.
But do you know that in normal circumstances as a gambler you have to do your kyc verification in gambling before any other things, even though they have not ask you to verify your account, I think it's better for you to verify because if they have not asked you do so, during the time of withdrawal they definitely ask you to do your kyc verification, so I do believe that kyc verification is necessary and needful at the early time so that you will not find it difficult to run your verification when is needful, some people does not like to review their document but when they win a large amount in casino they input their document that is on secret in order to cash out their funds
Actually we can't avoid this to happen since there are so many circumstances like you win a frequently or there's a lot of money involve in that win or there's sudden change of activity and the casino want to verify to know if the account is maybe safe. So its better for gambler to stay away on a casino claiming that they would not ask KYC to their costumers since in long run it will happen and its feels like we deceive. More worse if they turn into scam that's why maybe better to look at it as red flag then go to reputable casino which is transparent on their KYC process since they can offer more secured platform and that could give us less stress.