How much value would Mastodon server greylisting provide? Rather than limiting communication to whitelisted trusted servers, you could hide posts from unknown servers until they are approved. Maybe that approval would happen at the user level, maybe at the admin level. Might work well in conjunction with knowing a server's signup policy (e.g. open vs. closed registrations)
Really though, I'd love to see a trust model where info on known bad actors can spread through your network, and 100 friends who trust each other don't have to individually ban the same person.
@annika I've been thinking a lot about this. Propogating blocks shouldn't be difficult, but that would still reduce down to the problem of maintaining a whitelist (where would you accept blocks from?).
Of course for that to work blocks would have to actually block 🙄
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