For the sake of sanity, I will just report that at the moment I have two accounts on Mastodon, one on a Meta-banning instance and one where they aren't banning them.
They're mostly identical, short of the faact that I get one opt-in follow who has both Masto and Meta accounts showing up twice and I get to see the few Meta employees with the test accounts I follow out of curiosity.
The level of discourse around these has been abysmal, honestly. I'm extremely disappointed on the "fediverse". Not because Meta is good or because I like them, but the level of inaccuracy and misinformation in the community at large paired with the unwillingness from the people who know better to set the record straight has been a rude awakening that social media is social media and this place isn't free from any of its dysfunctions.