Piefed has two user rating systems. Your attitude, which is public, and allows people to see what your ratio of up votes to down votes is. The other being reputation, which is generally reserved for administration and moderation iirc. Which is an accumulation of how other people upvote and downvote you. Basically the sort of thing anyone could get just by looking at the public information just condensed all in one spot.

Anyone calling it social credit score is being disingenuous. The most controversial feature it has is its content filtering system, which is disabled by default.