According to Statcounter, Linux's share is 3.86% and rising; but I'd imagine that quite a bit of the almost 16% 'unknown' is also Linux.
https://gs.statcounter.com/os-market-share/desktop/worldwide
Not insignificant at all.
https://gs.statcounter.com/os-market-share/desktop/worldwide
Not insignificant at all.
Again, not huge numbers but also not insignificant. But they are quickly growing and taking share from Microsoft. If we look back at (Dec) 2021 the numbers are 1.8% and 2.2% respectively. Those gains are meaningful.