My problem is the constant "x casino is reputable" rhetoric that I see not only here but on other, similar threads. The problem with this idea is that it is a form of denying the antecedent: you are changing the principle, "if they have scammed someone, then they will be marked as scammers," to "if they are not marked as scammers, then they have not scammed someone."
It is called "selective scamming".
I don't know if sportsbet.io are scammers, yet but If the player didn't pass the KYC test, how can sportsbet.io can prove it?
By sharing his KYC documents? That doesn't make sense to me.