An exchange or gambling site may ask for KYC during withdrawal. It is common when a user violates their rules. Most sites only ask for kyc when a user has money laundered by exceeding their withdrawal limit. Or when someone breaks the rules . It sounds like one of these happened to you so the site asked you to kyc .
KYC can be asked not because you violate the rules, its just that the site is taking care the security of the platform since laundering can be a thing if they allow the gamblers to withdraw easily.
This is another accusation made by OP against another gambling site, how can we trust if there’s no given proof? This might be a propaganda to ruin the reputation of a good site, don’t believe on this and look at the trust rating of OP.
I seen op profile feedback given by Yahoo. It looks like the op is trying to make a false accusation against DUELBITS. Although he has done similar deals with other casinos before. The result of which we can understand by looking at the reason of negative trust in his profile. On the other hand I know DUELBITS as a good casino site. I don't think they treat their users unfairly.