A more interesting example would be From software issuing a “moonlight sword” nft (maybe for an achievement like 100% elden ring) and various indie devs creating souls-like games choosing to honor it within their game.
1) NFTs are the most expensive, least efficient way to implement the least interesting part of this technology. Even if you accept the dubious premise that they do even that job well.
2) You have explicitly described a system in which every single agreement between devs would require special testing. Is the moonlight sword balanced in the other game? Don't I still have to describe literally every aspecet of the moonlight sword other than who owns it in the second game?
3) Skins and other microtransactions are per game, by an absolute law of their design. That is the point. A game developer has no interest in honoring a microtransaction that I can prove that I paid some other game developer for. I would want my cut.
4) The condition upon which you have proposed that people can acquire the moonlight sword is... for beating Elden Ring? So it's a sign of status. Except that it's a sign of status that I can sell, so it's actually just a signal of wealth or status, maybe? Maybe I can't sell it. But wait, why did I make it an NFT then. So I must be able to sell it, but then it is presumed to have a dollar value, so why wouldn't Fromsoft sell it in the first place. Sounds a lot like a regular microtransaction.
Which brings me to my final point.
5) The market for microtransactions is already very optimized. Videogames are already very good at extracting every penny that people are willing to pay for bullshit cosmetics and play to win garbage. You can't even make money hucking this shit.
Your comment about “trust” has little to do with the technology. It’s a cross between legal gray areas (which would need to be solved/accepted if this becomes the norm) and dogma surrounding web3. I tend to agree that this isn’t likely to happen unless from software essentially abandoned their ip for some reason. But if that happened, it’d be a cool way for the legacy to live in future games in a way that pays homage to the original creators. It’s a use case that makes much more sense then just copying a random gun from one game to another because there are years of history in the item.
I do think for this to make sense you'd have to have, you know, one blockchain everyone used otherwise you still have the "10 app stores" problem, no?