I know that duelbits is one of the highly trusted casinos and I agree that it's the player's responsibility to read the service's To before using it but, to be honest, I've always been against asking for kyc only when the customer requests a withdrawal. It would be better to ask it from the start when the user creates an account or at least be as clear as possible when it will be requested (such as: if you're going to deposit/withdraw more than $xx, you'll need to verify your identity).
Casinos know that if they asked for this information upfront a great deal of players will not bother to use their services and they will move to another casino that does not behave in that way, however I agree that I would like for the policies regarding KYC to be as clear as possible, I think casinos keep this information hidden so scammers do not abuse their policies, and while I can understand that it is also very troublesome that many players that are honest and which only want to have some fun have to reveal their personal information because they triggered the internal systems of the casino, without knowing what they did wrong for them to receive this treatment.