It seems like an ideal application of text-based inference: to assign points depending on how someone interacts in a discussion (using correct factual arguments, not straying away, not misdirecting, being considerate and reasonable, and so on).
It surprises me that no one tried it before.
So, why we don't have any automated explicit karma-based moderator anywhere?
Further progress is blocked by the need to develop a general test classifier, that is blocked by the project of migrating my arangodb systems (like my RSS reader) to Postgres.