For the same reason Windows is more popular, the proprietary ones will be more popular. Then comes Embrace, Extend and Extinguish. They add things that are only in their version. Apps uses it forcing reimplementation in original(open) version or breaking compatibility with it( I think thats how Google+ or something made XMPP kinda obsolete )

We might be onto different goals here. I want majority of people adopt Free software, rather than just me personally living with it only(which create more problems for me).

The thing about permissive licensing is that ptoprietary softwares get whatever they need from open source and whatever they do with it is unavailiable back to open source which is one way free labour for them