I question the methodology here. The same site lists Linux desktop share at 2% in my country specifically. It feels like if it was that high you’d see it on people’s laptops more in coffee shops and what not… but I’ve yet to see a single other person using Linux on the desktop.
I know most of that 4% is in India… but still feels like it should be more ubiquitous if the number is that high.
With 2%, you would roughly find someone using linux for every 50 computers you stumble upon. Maybe it's not as far off as you imagine. However, like someone already mentioned, the distribution isn't homogenous, and maybe there are concentrations of linux computers in some universities, businesses, etc.
Or maybe linux users don't go out as often as the average person, so you never get the chance to see them in coffee shops lol. If the other linux users are like me, that's exactly the case...