Ultimately, it's a zero-sum game for all the "posters". The attention and time of your following is finite, and other posters are fighting for it, too. The "cloud algorithm" defines the rules of the game and matches your content to its consumers.
(Mastodon is very fragmented, so YMMV based on instances and who do you follow ... though I'm pretty happy with infosec.exchange , and surprisingly nowadays most quality stuff is on Youtube in the form of long video essays.)
And that's a good thing, because if someone as toxic and unhinged as Musk understood how SM really works, it would be a global disaster.
We've already seen what happens with that in the MSM space. So far, SM has only had fragmentary versions of that kind of propaganda monolith - Cambridge Analytica, bot farms, and so on.
Those are all bad enough. But a global platform that existed purely for propaganda and disinformation while pretending not to would be horrific.