What about the users who don't want to have their activity exposed? Have you thought about it?
I know I can't really say, it's personal, but it is a bit to me. It's part of my privacy
That question has been asked before about reporter's badges if I’m not mistaken, and I accept that everyone has a right to their privacy, even if they don’t want to be publicly known to be doing something good. I guess anyone who has such an opinion could contact the admin and ask that he not be exposed in public.
For me, this is not a problem, and I do not consider it a violation of privacy (like most other members of the forum) - nor do I expect that someone could take revenge on me for reporting his bad posts since only mods/admins can see such a link.