bazzite seems to be so crucial for widespread adoption, watching with great interest!
From Wikipedia, the free encyclopedia
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.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Because whoever generated that chart decided to only include these. The raw data is avaiable for anyone to play around with here in csv: https://data-analysis.fedoraproject.org/
It looks like to me that the chart is coming from the ublue project, so if you are a tech person, you can fork their countme repo and modify it to your needs.