https://survey.stackoverflow.co/2024/technology/#1-operating-system
27.7% of professional developers use Ubuntu as their "primary operating system for work". (Plus a few other Linux are there.) I don't really trust the survey (how can primary choices total more than 100%, and how WSL and Cygwin are there?), but if it's remotely close to reality, that "Linux is not viable for work"...
(Better data welcome.)