I find it hard to imagine that a developer of a game is going to be happy with someone bringing something from another game into theirs. How would that even work? Does the developer need to create stats for every item that's been in any game that's existed up to that point to balance it? How would it work if the mechanic the item grants isn't even part of the game you are in?
If it's a standard NFT the original developers don't have a say in how a different developer wants to integrate the user's ownership of that token. If I see that your wallet has ownership of "sword of fire" from WoW and want to convert that to "saber of flame" in my game I can. I could even leave the same name, program the same design of the original weapon in, and appropriate the mechanic into my own game (ignoring the legality here and just focusing on feasibility). This is all possible because of how blockchains work -- all transactions (and the resultant change in state) are public and I can always identify which NFTs you own that way.
EDIT: I also wanted to add in that the smart contract that supports an NFT can be made in a way that allows the original developers to collect fees on every transfer of the asset. This means it might even be in my best interest as the original developer to endorse other games using my in-game NFTs because the longer I can get people transacting with my asset, the longer I can keep collecting revenue. I might even pay other game developers to integrate my item into their game to make this happen.
None of that makes any sense. I get what an NFT is. What I want to know is how the mechanics of taking a "sword of fire" from WoW and importing it into RandomNewGame will work without the developer of RandomNewGame specifically programming it in. And if the requirement is that they program in some compatibility with the WoW sword of fire, will they not need to then also program in support for all the billions of existing and infinite yet-to-be-existing items that someone will want to import into the game? You can spin SciFi tales to a different question. I'm asking for specifics on how this ridiculous idea would work.
