[dredmorbius]

There are some ... "interesting" ... edge cases around shared blocklists, most especially where those:

1. Become large.

2. Are shared.

3. And not particularly closely scrutinised by users.

4. Via very highly followed / celebrity accounts.

There are some vaguely similar cases of this occurring on Twitter, though some mechanics differ. Celebs / high-profile users attract a lot of flack, and take to using shared blocklists. Those get shared not only among celeb accounts but their followers, though, because celebs themselves are a major amplifying factor on the platform, being listed effectively means disappearing from the platform. Particularly critical for those who depend on Twitter reach (some artists, small businesses, and others).

Names may be added to lists in error or malice.

This blew up summer of 2018 and carried over to other networks.

Some of the mechanics differ, but a similar situation playing out over informally shared Web / search-engine blocklists could have similar effects.