I didn't know that Bitstarz is actually a scam crypto casino because my friend recently sends me a referral link so that he could get a bonus on the gambling site. I hope OP would definitely make an update list about scam crypto casinos so that only a few people will be deceived or tricked by these fraudulent gambling sites.
Seeing their UI, it seems the Bitstarz group always requires KYC before the withdrawal. Their site is similar to bitcoincasino.io, where withdrawal can only be made after users submit their KYC. It is just my assumptions, though, since I'm not interested in playing there due to the site reputations.
When you see "20 free spins no deposit bonus," it usually means mandatory KYC. #thereisnofreelunch