I wonder if some of this is cause by not logging out from everything? You can probably log out of gmail, but not the chrome browser and not realize it. And the browser will still record everything. Or the opposite.

I am a bit curious about some of the claims about sync on iPhone. I don't have one, but is it even possible for another app to reach the internals of Safari? I would think that is locked down. Or are they logged into their google account in the browser? As for google getting the voice and text from a messaging app, how would that be possible unless its an actual google app?