I like that Flatpak counts as a distro in this chart. I assume it's because the Steam flatpak does not really have access to distro information when the survey hits.
Also, the change between 2020 and 2024 for Arch and Ubuntu is wild. They switched places....
Yeah, my first question when I saw the title was "how do you even gather this data?". It's actually pretty cool as steam probably has rather reliable data in its own niche.