I have maintained, and continue to maintain, that my concerns about #Meta and the #Fediverse have nothing to do with threads as such and everything to do with how they act around the protocol.
Them releasing a client or a server would be very, very bad news in this space. Them running a multi-tenant (or multi-single-tenant) setup would be very, very bad for the fediverse.
Their presence on a single domain just doesn't say or do all that much in the grand scheme of things.