Redditors already scream at people when they get a downvote and blame it on the person that replies to them, even if that person didn’t downvote them.
I can see this being dangerous and leading to a lot of bullying. I know k-bin already publicly shows this. I can see who downvotes my comments/posts when I open up the post in a k-bin instance, without even being a member.
All of those domains sound like blogspam domains.