The quickest, easiest and most effective way to solve this would be if the official apps & website stopped promoting mastodon.social, and instead promoted a rotating selection from a pool of reliable servers with solid track records.
At the moment the front page of JoinMastodon is implying that people who want to join Mastodon should join mastodon.social. This is causing the Fediverse to centralise, as the percentage of active ...