The data center infrastructure that Facebook (Meta) has is probably in the top 5 in this world (behind only Amazon, Microsoft, Google). They might want to become a cloud infrastructure provider for some side money and buy themselves some time to figure out this Metaverse fantasy :) Hey, AWS started because Amazon wanted to lease out their spare infrastructure capacity.
If we are spitballing ideas, If I am Zuck I'm looking at figuring out how to buy Valve or build a gaming platform. I don't know how they can be successful in whatever the fuck the Metaverse is without a gaming/media platform.