Why are Arch and Manjaro in quotes, but Ubuntu LTS and Linux Mint aren’t?

They're probably putting the rolling releases in quotation marks -- I'm guessing they're pulling the Description field from "lsb_release -a", where "Arch Linux" says just that, while each Ubuntu/Debian/Mint/etc distro will show specific version numbers (and that would explain why Arch shows up as a higher share than Ubuntu 22.04.3 LTS) -- I'm sure there are several more Ubuntu entries in their list that would total more than Arch's percentage. I'm not sure why they arbitrarily truncated the Linux list at 4 while showing 5 Windows/Mac releases, though.

EDIT: Found another screenshot where they list "SteamOS Holo" in quotes, too. So I guess they just include quotes for every distro that doesn't show a version number in that field.