So someone’s selling in-game items for games with no game with the expectation that games will just magically support them despite the cost to the developers to do so?

FWIW I can definitely see an asset store like model if that’s what you mean. Where games that share an engine can share developed assets. But you need to look at how that works out in practice in terms of how much integration cost there is, gamers tolerance for asset reuse and actually how broadly applicable it is between different games. And even then extant asset stores already work perfectly well so it’s not clear what putting it on the blockchain and presumably some decentralised storage actually provides.