then the decisions of known/old/large ones can be weighted by everyone to make their own decisions
this leads logically to some kind of web-of-trust / instance-reputation-scoring system down the line. this can be both good and bad, but if surfaced somehow could serve as a direly needed instance selection aid for new users.
ie: example.net is aggressively blocking this type of behaviour, but is above average blocked by others on this other metric