Maybe have some mechanism to subscribe to "feeds" that rate users according to their own metric.
If I decide to trust @StopMassDownvotingYouIdiot's script or whatever that detects shennanigans like this, I can have its score or tag attached to a user. Could subscribe to multiple.
In all seriousness, Google needs to get on providing an easier way to specify that a search should hit the Fediverse. site:reddit.com works for Reddit, but there is presently no analogous operator on Google's search for a distributed system that spans many domains.
I mean, it's great that you've made this, don't get me wrong, but they really should do that as well.