Sync is pretty obvious since you clearly have no control over the backend. However, that is a non-issue for someone paranoid enough about where their data goes. Clearly you don't enable it.

I think a healthy dose of paranoia in today's world is fine. I worry a lot about what apps are sending what data where, and whether I have control over that. You, however, seem to just be making blatant claims and touting them as fact. You are part of the problem because you are spouting what amounts to misinformation, and not considering that we have tools available to us with which to verify what an application actually does and whether it is malicious or not.