If they’re tracking web use by PCs they know are not servers, then it’s likely due to a combination of local AI computer web scraping and people using SteamOS devices, which are running Linux. Prosumer local AI users often learn Linux if they don’t already know how to use it, because the software runs more efficiently on it. Anyone with a Steamdeck or Linux distro like Bazzite copying it on the desktop can exit to desktop mode and use it like a normal PC.