De-centralized, non-goverened: Everybody acts how they want, thus creating consensus.
It only starts to be distorted by greed (=buying huge votes).
Everybody has their own opinion about how much is too much; if everybody voices them > consensus!
And no body has a problem with receiving downvotes; they are an important and honest tool. btw. honest: You can judge your own post, and think about what's its value. If you earn less rewards, go and buy a vote. Me, I've sen by far more valuable posts paying out about 1STU...