Linux

I disagree while agreeing. The biggest reason people use windows is simply because its pre-installed. That's the same reason people use Edge on Windows or Bing as their search engine. They get it preinstalled and don't know how to change it.

If you install anyone Linux and give them a simple and easy distro preinstalled they're usually fine with a few words about how to use it, update it and install stuff. Especially if they're not tech savvy because in this case they wouldn't know exactly how to use Windows either. I mean look at companies: how many employees use Windows in their daily work but still don't know how to actually usw windows? They get teached to use their software and tools but not the OS itself and have to figure things out on the OS level if they would want to change something on Windows too.

My observation was that people that are not tech savvy find it easier to understand some beginner friendly Linux distros than Windows.

If on the other hand a person is used to use Windows and knows how to actually use Windows it's harder for them to switch because things are just different on Linux. For me it's hard and annoying to use Windows which I have to do at work since February. Before that I used Linux in private my whole life, I used it in school because my school never used Windows as one of the few schools in my country and my last employer also used Linux. And from that perspective I can say that Windows is hard and not intuitive. It's just being used because it's being used. I guess you could compare it to Whatsapp vs Signal. From an objective standpoint Signal is better but most people still use WhatsApp because others use it and because it comes preinstalled on some Android phones.