Calling this an "operating system" just seems like misdirection from the actually cool problem of visualizing distributed systems. I mean the whole thing about the Metaverse is that it's simply a vivid realization of what's already happening on the internet --- it's not some extra layer on top.
This technology is pretty impressive, and I get the marketing speak that will appeal to certain folks, but I'd rather call it what it is --- an impressive, distributed, rendering engine.
IDK, maybe I'm thinking about this all wrong.