There's a huge human factor, which Microsoft, as a business, exploited very successfully. For many, Windows is the default because that's what you see on other

There's a huge human factor, which Microsoft, as a business, exploited very successfully. For many, Windows is the default because that's what you see on other's PC, taught in schools, used in many office environments. And as a tool, it works good enough for them. And change is hard. For many, the FOSS principles are sympathetic, but not compelling enough to change.