How do you know if someone has been punished?
To preface this, this isn't because I want to stalk the people I report and giggle whenever one of them gets banned.
Rather, it's because I see people saying "This guy flamed me, so I flamed back, but I got punished and he didn't". There's no way of knowing this unless either you stalk their match history (which wouldn't show you if they have chat restrictions), or you get a notification (which I've heard only occurs if your report is the final straw in getting them punished).
So where are people getting these claims?