The Defender of the Unicorn hat is a very special hat, since it has two triggers:
- resolve the puzzle (save Sparkles)
- receive a status-completed on a question
Since Winter Bash 2021 came to an end, who, or at least how many users, got both triggers?
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If a user was manually awarded the hat for posting something on meta that was status-completed and then successfully completed the quiz, we don't actually record anything (since the reward for successful completion is getting the hat, and they already have it). So I don't have any way to accurately answer this, other than to say that it is more than 0, and fewer than the number of status-completed posts tagged with winter-bash or winter-bash-2021 that were posted during WB this year.
My understanding is that regular users have no information about how hats are earned, just that they were earned. Someone from the development team may be able to tell you stats on how many people earned the hat via route 1 versus via route 2, but I'm not sure if it's worth their valuable time which could be spent on other development projects.
I'd like to add that I got the "Defender of the Unicorn" hat without doing either of those two things mentioned. I discovered that there was a bug in the awarding of one of the hats, and communicated my concerns in the Winter Bash 2021 chatroom. It turned out that there actually was in fact a bug, which then got fixed and I was deemed to have done the "equivalent" of having asked a question that got the status-completed tag, so I was awarded the hat manually. There's therefore technically at least three different ways to get that hat (though you can just group what happened with me into your second listed category).