how do you know about all these information? i play on primedice before and i saw a guy withdrawal so many bitcoins and he can withdrawal easily without problem and kyc. i think gambling site use kyc only for a player that had a suspicious activity on their account and for withdrawal a big money like 50 btc and more.
Well, you can see a lot of high roller in scam accusation that their account got suspended, freeze, or ban after they try to withdraw a large amount, some of this site are listed of OP. For me, I won't mind sending documents if I know that sites are very trustworthy.