2. I find the best way is to uninstall any app I can. Why take the risk?

3. I wonder about this question. If you use the service, you used it. Your other questions seem to be about apps that used it without your knowledge.

4. No. It's all about apps and you.

PRIVACY. Forget about it. Given CIQ (see google) and more, anything on the Android phone does leak. You find folk that want you to believe it's secure and you may want to believe but the awful truth is that a cell phone is not secure.

Bob