Previous job: Windows, because it was a company issued laptop. Plus a lot of the company was built around the MS ecosystem.
Current job: Linux, because I got to keep the perfectly decent Dell laptop when I left. I wanted to make sure I purged everything, so it’s running LMDE now. Plus, there’s not much outlook and teams stuff that I have to use.
Don’t hold your breath. .su is still around, so I doubt .io will disappear very soon.