One thing you should understand is that making all people pay for the ill intentions and actions of few is usually a bad system design
there are several articles and research online stating how KYC, besides being useless, is costly and adds a lot of friction to businesses
Sites aren't really given a choice in this matter sadly thanks to trash government systems and their excessive regulatory policies which is why they end up enforcing KYC in some form or another to survive basically.
BTC's popularity surge over the years left to world governments trying to take back control in this manner.