There are two score on piefed :

• attitude : the ration of your upvote and downvote
• reputation : the vote you receive

Most of user have an average attitude score around 70%. People who really downvote have an average score around 30%. Once it reach a threeshold, it will remove your ability to downvote.

And to counter karma farming, post in meme community provide 0 reputation.

As far i know, there is no karma farming. They are tool for mod and admin to help them in creating communities and remove abrasive people.

So imo, there is no credit social score because there is plenty tool where you don’t have to use downvote as : keyword filter, community & user blocklist. Its only effect, the score system, is removing your ability to downvote once you reach a threshold. That’s up to mod team, if they want to keep people that downvote a lot. And it improves the whole community.

Edit : typo.