I've explained a little about downvoting in other articles of POB street. I use the DV to remove rewards from fraudulent articles. People can use the DV to remove rewards for over-rewarded posts..

This is what I replied at..

You just said what you use the DV button for but it's Just you, some downvote because they don't like your post not because there is anything fraudulent in it... And sometimes when that happens, hivewatchers have nothing to do about it, I can downvote anyone without any concrete reason which is bad, before the downvote button is used, they should be a part where we should explain why a post should be downvoted...