@sydneyfalk I find it as a too difficult task to do in a distributed network. The only way to make a system not explotable by humans is to have humans keeping a watch on others.
I think, in mastodon's context, the trust system can be solved by having trustable servers. "You can only join this instance if you're a public figure", for example, so users know those accounts are real. What would matter then is the instance, not the amount of followers.