Meta is not gonna buy Mastodon or any server, this is based on absolutely nothing and untrue.
Yes, some of us indeed got contacted by Meta/Insta because they are working on a new social platform (this was in the news) and they are looking into joining the Fediverse (Mark Zuckerberg also told this in the recent podcast)
SO.
This contact was about a "heads-up" for a potential big platform to join the network and not for a "take over".