We can answer this by looking at how many facebook users are okay (implicitly) with using facebook in exchange for access to their data and exclusive rights to place ads right in front of them. The answer is 100%
The social dynamics are completely different. Second Life showed that very clearly.
The three biggest things in Second Life were fantasy consumerism, fantasy entrepreneurship, and fantasy sex.
Unless FB is getting into those markets it's going to find the metaverse a tough sell.
Not least because the whole point of fantasy is that it's not really you. So that immediately conflicts with FB's only-real-identities dogma.