you'd have a hard time looking for that kind of bookmaker, The majority of bookmakers nowadays that have a good reputation usually have in their ToS that they can request KYC at their own discretion, they may not ask you to perform KYC during registration but they could ask you while gambling or while trying to withdraw. also, the two sportsbooks you mentioned also have those kinds of rules in their ToS.
I believe that no casino likes to intrude into their customers privacy, I know that they're more interested in your gambling in their sites and hopefully losing some money. They ask for KYC verifications because of government regulations so we can not blame them if they ask for it at anytime, it's to protect their businesses. We should just accept KYC as part of the personal requirements that intrudes into our privacy if we want to gamble on crypto casinos. If you're looking to gamble in a reputable casino that means that you wouldn't mind to share your personal information at some point.