> They'll have theirs default and most people won't bother changing it. Except in order to have Google services and the Play store you need to agree to a licen

> They'll have theirs default and most people won't bother changing it. Except in order to have Google services and the Play store you need to agree to a license with Google, which can easily mandate you not replace their stock apps with your own (or rather, not default to your own, unless the user indicates otherwise). Now, you could ship a phone without Google Play Services, but that's very unusual in the west (less so in China et al).