He even mentioned blockchain and NFTs and how it sucks to buy digital items and having them locked into a single platform.
Zuckerberg most likely is suffering an existential crisis, he's said before he doesn't know if he'll ever top what he achieved with a project like FB. He knows he's not very liked and he's looking for historic legacy.
However, the way the metaverse is developed cannot come only from them, there needs to be a consortium of institutions to debate on open apis, it has worked out so far for the web with W3C.
I wonder if there are already any efforts for standard open Metaverse protocols.