More - As far as I can see, only Oded has this hat. Looking at his activity, it can be one of these three things : comments, added tags, answers. Its not the added tags, as all of them are mod specific tags. It cannot be comments as many other people here are doing similar comments. Looking at his answers, he has 3 accepted answers, on a negative voted question, duplicated question, highly voted question. With both high votes answer and low votes answer. After searching for a while, I found many users falling into all such scenarios without the hat. So I am at dead end now. —
Optimizer 4 mins ago