When I first saw the complaint from OP with no evidence and proof of payment to profile wallet to back up his or her claims, I just had the thought maybe one of those regular paid random guys to do a dirty job on the casino I guessed.
It was obviously clear from the terms and conditions together with withdrawal policy that KYC was required and that they have every right to demand for KYC when the need arises but OP failed to read through all these before making deposit if truly it happened as claimed by OP that the casino is holding unto his or her funds and demanding for KYC.
but there are possibilities that they have a banner with big letters written that no KYC is required then at the bottom there is a small letter that states upon signing up this is mostly what I noticed on advertisements or promotions to attract new customers, others will say that no KYC but terms will apply so still there are KYC upon withdrawal but I don't see also any proof from OP so possibly dirty tactics from opposing casino to just give them a bad review or etc.
Maybe this is deceiving act by a casino to attract new casino. They claim that they don't require KYC on registration but later on they will say it they need it on withdrawal which is totally not good to see. Maybe this is what we need to notice on early part of their operation to avoid such shady actions by this kind of casino. I guess we need to be more careful choosing a casino to play so better play on the old reputable casino rather than risking our fund to new site which doesn't show any good deliver a quality service to their gamblers.
I think we're ambiguous about the OP's claim and many similar incidents at online casinos in the last few months, maybe they are deceptive to attract new players who prefer anonymity or there really is no scam and the word "NO KYC" could be meant only when we make a deposit for gambling and it may be true that there are some small sentences that may be plastered on promotional advertisements, and this is indeed ambiguous because the OP's claim is without evidence and accompanied by so many frauds like that that we cannot find a bright spot whether it is fraud or No.
What was the latest update of this topic? does the OP managed to submit his KYC or did he get his winnings? All gambling site have a reason why they should hold or confiscate the winnings and if they don't give a valid reason then they just destroy their reputation.
I haven't seen any updates from the OP regarding his withdrawal, did he decide to do KYC or leave his gambling winnings, and also I haven't seen the evidence that the OP should provide as proof what he said is true and if it does prove to be fraud that would be very bad for the casino.