I think the argument is that app distribution is controlled by Apple on iOS and by Google on Android, and GP is happier ceding control to the former but not so

I think the argument is that app distribution is controlled by Apple on iOS and by Google on Android, and GP is happier ceding control to the former but not so much the latter. As Google Play Services become more entrenched in the basic functioning of the OS and apps on the platform, it becomes harder to extricate Google out of the Android experience, even if one has the ability to use other app stores. I think it's a very reasonable position.