his stated goal or a goal was to preserve freespeech
the user base is not the biggest but influential
likely elon owning twitter will shift election, which may have been his real goal in which case there likely wasnt another choice
something like nostr will be far better for freespeech and probably an 'everything' app so if he is serious he will adopt similar, being the innovative engineer he is he would have to atleast explore p2p etc to cut server costs