I don't know why people are so obsessed with this idea of in game items as NFTs. It's a terrible idea.
Games have no reason to be decentralized. All of the information can be stored on the company's servers, like an MMO, or if it's not critical to maintain scarcity, locally on devices without the whole network, like pokemon (the pokemon themselves, which can be traded and such).
You can't reasonably expect games from other companies to implement the same NFT scheme. That's just not how games work. A longsword in dnd is not a longsword in final fantasy, nor is it a longsword in dark souls, nor is it a longsword in minecraft. And even if it were, why the fuck would you want scarcity on longswords? 99% of all items in any game are typically very easy to obtain, with a few rare things standing out, and with a natural progression built in. What would it even mean to bring your 50 hour investment in a top tier perfectly slotted jrpg omni magic blue elemental Atk+++ Spd+++ Crt+++ Mag--- weapon to a game like call of duty?
Even if we're just talking about a single game universe, like a dnd setting. Maybe there's now 3 baldurs gate games, for some reason not designed by the same company, but all willing to share the same exact item spec. Where is this concept useful, still? Can I bring my +10 longsword (a big deal) to the beginning of the game and just trivialize the singleplayer mode? Is it more of a multiplayer thing so we want real world wealth and status to be the primary driver of character strength?