DistroTube (A tech youtuber) pointed out this would probably happen - Mastodon servers seem to be a more polite place, and legions of upset twitter uses would just not fit into that culture.
On the flipside, I was last on twitter in 2020. Joined again recently out of curiosity, and it's a much more pleasant site. (Not attributing this to Musk, as I was not on twitter immediately before him). No longer has clickbait partisan news articles all over the front page, and it seems much easier to just follow chill people you find amusing rather than tempting you with cortisol spiking arguments all the time. YMMV.
Counteranecdata: a nontrivial number of people I talk to have been leaving Twitter because their feeds are suddenly filled with MAGA ragebait and coded bigotry, which is the absolute straw for them.
2020 was the height of Trumpism, so it's possible that it really is calmer even so, or it might be more calm for new accounts for some reason? I'm certainly not planning to sharecrop on the Elmo plantation to find out personally.
Weird, when I look at my feed it's either people I follow, people they follow (some of whom I've decided to mute), and their replies to people I don't follow.
Pretty easy to curate to me (if someone engages with too much "Ragebait", unfollow them), but I can't speak for everyones feed.
On the flipside, I was last on twitter in 2020. Joined again recently out of curiosity, and it's a much more pleasant site. (Not attributing this to Musk, as I was not on twitter immediately before him). No longer has clickbait partisan news articles all over the front page, and it seems much easier to just follow chill people you find amusing rather than tempting you with cortisol spiking arguments all the time. YMMV.