Well; it’s either going to be people who are sufficiently privacy-conscious to remove as much as possible from their user agent string, or more likely people who have written bots and scrapers that hit popular websites on an absurdly frequent basis. Team penguin, in any case ;)
Not just Unknown. How many privacy concious Linux users are there? I bet many of them would prefer to blend in with the crowd and use Windows as their user agent.
Considering that not many people use BSD or the others, I would guess that most of the “unknowns” are actually Linux users. That means we’re probably already at over 6%. :-)
This is through summer and universities break. Its fair to expect a higher increase through the last Quarter of the year and probably surpassing ChromeOS with 3.24%
A lot of people will attribute this to the steam deck, but IIRC these stats are from major website user agent visits, not many people use their steam decks to browse the web daily.