Working at a small software company for the summer, the dev team I’m on all uses Linux - there isn’t even a setup for windows. Don’t know how that decision was made though, it was way before my time. But it was very nice to come in and see a thinkpad with kubuntu on it.
Other teams use windows though, QA and some non-technical roles like sales.
There’s a lot of Microsoft stuff used (office, teams) but the web apps work fine, and we do most stuff in slack anyway.