Hey Nebula_Matrix, The main reason is that many crypto games involve selling the artwork included in the game whether it’s characters, items, or other assets. While you’re licensed to use the assets in your games (including commercial projects), you don’t own the copyrights to the artwork, so you’re not allowed to sell or redistribute them.
Also, since many crypto games involve financial risk where players can win or lose money/crypto, I prefer not to have my work associated with that space. I hope you understand! (: