Most gamble sites do not publish the KYC on their site, and when you win much money they will always ask it as well. So then it is much better to state this KYC in the terms. Only good.
Only good thing is that they run this site with a valid license. We saw many unlicensed casino's the last time.
Its all about personal preferences obviously. In this case you think that it is not a big deal to do KYC but it is a big deal for some other users including me. There are still many people want to gamble anonymously especially in bitcoin/crypto gambling sites. I myself prefer not to send my personal details for my gambling activities so I will always look for gambling site with no KYC. In case of a big win, it depends on how big the win is because value is something subjective.