The Desktop Experience on Linux is years ahead of Windows. Only users who have to use apps non available on Mac or Linux use Windows.
Most people don't seem to be using the best possible desktop experience. Their desktop is decided by an employer, or whatever is pre-installed, or who knows what. But an ad in the start menu doesn't seem like it's likely to budge that number much.
0. https://gs.statcounter.com/os-market-share/desktop/worldwide...
[citation needed]
And is also relevant: https://news.ycombinator.com/item?id=35325280