For me, it just came down to how unintuitive and slow Windows’s desktop environment is. Setting up the most basic customizations requires going through like 15 sub-menus or dealing with the registry. Also, GNOME and KDE are just so much prettier than Windows’s desktop environment.
I mean Jim Jones was pretty damn effective at convincing a large group of people to commit mass suicide. If he’d been ineffective, he’d have been one of the thousands of failed cult leaders you and I have never heard of. Similarly, if Hitler had been ineffective, it wouldn’t have takes the combined forces of half the world to fight him.