They often have a card to use in their TOS, maybe stating they have right to change their TOS at anytime or some might state when they can request KYC from customer, which some may even say at anytime but if the customer do not go through it carefully, they won't see this and miss out thinking the casino is fully non-kyc.

Someone looking for a non-kyc casino or platform should be ready to do more findings like reading customers review and the likes than usual in order not to be tied down by some annoying TOS.