Free-software aficionado Ploum has an interesting take on Meta and the Fediverse:
"There are rumours that Meta would become "Fediverse compatible". You could follow people on Instagram from your Mastodon account. I don’t know if those rumours have a grain of truth, if it is even possible for Meta to consider it. But there’s one thing my own experience with XMPP and OOXML taught me: if Meta joins the Fediverse, Meta will be the only one winning."
Read the full article here [ploum.net].