What are some examples of grouping in the Fediverse? This question is in response to a post asking about how to stop corporate dominance in the Fediverse, but unrelated examples are more than welcome.

One example is a (defunct?) alliance between 3 national Peertube instances where they agreed to backup each others databases and have similar moderation rules.

It would be interesting to see if there’s any agreements between instances to block certain instances, like corporate-run (pawoo) or alt-tech (gab) beyond merely using a shared blocklist.