Additionally, you could even automate certain decisions. Let's say you are a pro-monarchy activist instance, and there is a post with title "Digest the aristocracy", containing pictures of peasants playing football with the king's head.

You could've easily set the following rule: if mods from both hermajesty.co.uk and puppiesandkittens.org flags the post, AND freedomforpeasants.com does not, auto-flag the post here as well.

In this scenario, even the "enemy" instance is making it easier for you to make the decision.