From what I have seen, the "solution" to moderation troubles in decentralized solutions has mostly always been... more centralization.
The only major decentralized forms of social media that I'm aware of that have confronted philosophical questions of how handle moderation have been Mastodon, Bluesky, and arguably Lemmy. I don't know of any sense in which Mastodon has increased centralization, I think its blocking tools have been distributed essentially since the beginning, not something that has iterated toward centralization over time in response…
So if for example #archlinux disagrees with your opinion and they decide to ban you for it, you are now banned from many other unrelated channels.
I have also seen subreddits that auto-ban users that have ever posted in specific other (unrelated) subreddits.