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.
Lets put aside about the proof of payment from OP but lets focus on the false advertisement by the casino.
The casino put a banner of NO KYC for crypto players, which is something against their own terms where they reserve the right to ask for KYC.
If you are a gambler who are against KYC and you see a banner tells you that the casino is a KYC free for crypto players, you must be very interested to play in the casino.
This is the main problem in this topic IMO, a false advertisement to attract crypto players who want to play anonymously.
Everything needs to be taken into account when we try to analyze the situation, even if the terms are very clear about the casino asserting their right of asking for KYC whenever they want, that is not the way they are promoting their casino, they are falsely advertising they do not require KYC, so any gambler reading that may assume that their terms and conditions will reflect such policy, when in fact this is not the case, making it perfectly obvious the casino itself is engaging on shady practices.