Maybe sportsbet.io is under some government pressure since they have some big sponsorships and everybody has their eyes on them so they are trying to eliminate any kind of risk whenever possible. Just a possibility and a shitty one...
Under...Curacao pressure? Lol.
Even if it's a crypto bookies, you still need KYC to identify a person.
If someone is accused of multi-accounting and casino enforce KYC to one account, only thing they really prove is that 1 account belongs to that one person. It really doesn't prove anything else, let's not forget accusation and reason for banning player in the first place.