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Whenever there's a blocker (one case from my childhood was how to use net send to broadcast profanity across the network), someone will figure it out, and by the end of the day EVERYONE knows.
Nobody was rejected because they used windows. It just so happens that none of the windows folks got past problem 1 of 3 (as in, they ran out of time without solving).
Edit: I'm remembering now, one of the windows folks did get to the end of the interview, and they were the first person I recommended actually, so it's not like it was a deciding factor, just something that I'd see and go "hm" about.
On the flip side, immediate green flags for me were: using linux, using keyboard shortcuts to manipulate windows / within the IDE, using an IDE other than vscode (vim/nvim or emacs are huge green flags), having custom scripts, having custom themes, or, the biggest one, self-hosting some applications. And Lo, these candidates also seem to perform the best in my experience.