I got a bit annoyed with amazon slots kyc the other week. Signed up via hideous, deposits fine, lost a bit then a month later I won some, was a few hundred up, tried to withdraw just my original deposit of 200 and they wouldn't let me even though no kyc to deposit 5 times over a 6 week period.
I think some of the casinos are very good at it but others focus the checks on withdrawl which I think is wrong way to do it