Maybe you can bet NFTs against other forum users, a lot for them has NFTs and like gambling, so, maybe if you find the right users and the right match to bet you could find a scrow who hold the NFTs while the match is going on.
The problem about betting the NFTs is the price of the NFT, the fact that I can put that NFT on a market and ask for $1 million that doesn't mean that's the real NFT cost.
That’s a good idea. Anyone who wants to do escrow? The bet against my NFT (number #777) would be about 0.22 eth. Since it’s a first and a fun one, I suggest doing it for free but open to all suggestions.