It still works as a signal, because (1) signing a comment requires some extra effort, and (2) it is harder to retract a comment that has been signed (since the signature remains valid proof of authorship even if the original comment is edited or deleted). A little bit of real cost and utility goes a long way.
It still works as a signal, because (1) signing a comment requires some extra effort, and (2) it is harder to retract a comment that has been signed (since the signature remains valid proof of authorship even if the original comment is edited or deleted). A little bit of real cost and utility goes a long way.