The tech has a lot to do with it. But I'm not sure Mastodon or BlueSky has the tech, they're mostly replicating Twitter but with distributed servers. I haven't checked Nostr in detail yet.

To avoid the toxic nature of Twitter you need to allow recursively organized entities/communities which moderate themselves locally, not globally.

In this case you can both allow the "virtuous" to group and be protected as a group, but also the "vicious" to group and be isolated as a group. Unfortunately our understanding of systems is so piss poor, no social media is doing this that I'm aware of.

Well I could say Reddit's subreddits are a step in that direction, although very crude, and the moderators scheme is less than ideal. Let's say more mini-monarchy than mini-democracy.