Thing is nobody is actually planning to do that. Right now some are trying to build their own small 'metaverses' but a connection, like a open standard is delusional at this point.

I am not delusional enough to think Zuckerberg wants an open standard. I think he wants "Login with Facebook" to apply to cross-platform immersive digital spaces.

This is similar to an idea we have been playing with:

https://www.betabytes.io/blog/introducing-the-metaverse

For instance, here is a video of a shared canvas:

https://www.youtube.com/watch?v=unVzxgjJNdA

Your idea is interesting (if not practical) because it opens up some weird questions, like: what if Second Life were a life simulator for some people, but a FPS zombie shooter for other people? Or: what if Fortnite became a dating app, like Instagram has over time?

Your PoC at least proves that you don't actually need cooperation between developers to achieve something. You just need a compatibility layer.

This video by a game dev does a decent job explaining why transferring assets won't work: https://www.youtube.com/watch?v=UKzup7XDyq8&t=3s

It's in the context of games, but virtual worlds have similar dynamics.

Sorry, I should have been more clear: I think the decentralization of shared digital assets is nonsense in theory, and it's even more absurd in practice because of the realities of software. I was just trying to present my understanding of the vision these people seem to have of it.