Someone should set up a third-party tool that mastodon/fediverse users can report abuse to. It should be staffed by people who are skilled at evaluating this stuff and who are paid to do it.
Recommendations/instructions to block instances/individuals could then be sent out to instance admins or even individual users (in an automated way), either as a collective or by subscription.
Or, rather, is anyone doing this already? #federatemoderation