All of the above. It's free (along with everything in the "app store"), it's stable, it isn't infested with ads, and the browser and word processor work exactl

All of the above. It's free (along with everything in the "app store"), it's stable, it isn't infested with ads, and the browser and word processor work exactly the same for all normal users. The OS shouldn't matter much to regular people who just want a web browser and maybe a word processor. It's really easy to use now. The installation process is far less arduous than Windows and you don't have to sign up for a Microsoft account or get nagged about not doing so. I would really struggle to imagine someone having trouble doing all their normally-Windows-based (filesystem, office suite, web browser) work on a mainstream distro now, even for the most technically illiterate user. If you're a power user though, it's like moving from a Corolla to an F-35.