Most as in SteamOS + Arch = 49.25%.

It's interesting how fragmented the Linux user base is in the survey. Excluding steam deck from the equation, the visible versions of Ubuntu are getting roughly 18.6%, Arch is getting like 14% of the desktop and Mint 21.3 getting 8.5%. The Flatpak version does put confusion into the data (hiding 11% of desktop versions) and the missing "other" 22.94% group accounts for 39% of the desktops so there may be lots of other version fragments hidden away, but regardless no single distro version seem to dominate.

It'd be nice to see the whole list.