I dont quite understand how this going to work. We have a casino that is a intermediary between two gamblers with NFT. How can bet or competition be fair, if NFT dont have constant price and there is not such kind as true average market price, as owners set all prices themselves. Two NFT owners can agree between themselves on a result of any game, and they need a guarantee who will hold NFT until game end. I dont think that casino is needed.

In case someone wants to bet NFT and wish to receive certain amount of money if he wins, then all I can say that NFT holders are so desperate with their fails in purchasing NFT, that they try everything to get rid of such bad asset or try to return any money.