Source
Linux currently 29.1%
Sample size according to StatCounter: 24,353,436 page views
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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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I don't really know about the uptick, but the general trend upward over a longer period of time I kind of wonder if it's due to things like the steam deck. I played around with gaming in Linux with wine back in the early 2010s and was woefully unimpressed with how little I could do, especially with the amount of work involved. I didn't really give it a second look at all, but after the deck released I was blown away by how much has improved, and it's motivated me to see how much I can get away with without windows. I wonder how many people have had a similar experience.