True but not likely gonna happened because his account violate the ToS that result for this KYC verification. His only way to get out of this trouble is to KYC and face the consequences of what he did or just leave the money in the casino. I doubt that this only involves about the amount of his balance because I knew a lot of whale player on Duelbits that still not KYC verified until now.
It is possible, but i can`t say that this is truth with my guarantee. I saw some gamblers that don`t want KYC and they have no any problem with it. They just sure that KYC is awful and don`t want it.
I don`t know what is the real problem the OP has but it doesn`t matter - there is ToS and he agreed with it, so he has to obey it.
Actually, it is highly unlikely that he will be able to do much with his account if he will not comply with the KYC procedure. We cannot know why the OP has been requested for KYC but the possibility of him violating their TOS very likely.
Yes, there's a lot of high rollers out there that has not been requested for KYC mainly because they have not violated any of the TOS of Duelbits.