As a guy who works with computers day in and day out, I can safely say that this is hyperbole. Windows 10 may have a little too much "call home" going on, but it's a fine PC operating system.
As for how DOS and then Windows became and remained dominant, that's squarely down to backwards compatibility. Plus, there is no corporate computing solution that beats the Microsoft array of Exchange, Outlook, and Office and so on.
macOS is a fine OS, no question, but there are still far plenty of reasons to use Windows. Not least the fact that if you want to run games, a mac is borderline useless, and lots of people game at home.