It seems to have plateaued and increasing more slowly. Combining data from Steam and Statcounter reveals this:
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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plateaued since when? if you look at the second half of the graph, 2022 forward, it looks more steep to me.
I take it 'geometric mean' is the geometric mean of 'statcounter' and 'steam'? What's the specific source of those latter two measures? For instance, when I look at linux usage on the statcounter website I get more like 1.5%, not 4%.