Welcome bonus is easy to abuse on crypto casino, thus only FIAT-KYC casinos that usually offer such bonuses. If you rate welcome bonus as necessary, you favor mandatory KYC as well, which is contradictory to your review.
Anyway, I just realized Rollbit has a strict KYC policy when you have to do lv 1 KYC before withdrawal. I don't remember doing so previously.
Unfortunately, a lot of fiat-casinos don't offer any more welcome bonuses due to regulations (at least in Belgium). In fact all fiat casinos in Belgium, are not allowed anymore to give bonuses, freebets,...
Seems that more and more crypto casinos are now also enforcing KYC...