And if a service can reach out to the Internet, it knows my IP can tell where I am. And if it suddenly cuts out after being on a known IP, then maybe I'm going through a local tunnel.

That's what I meant by you have to get really creative to think how this could possibly be impacting. If you have a sandbox, you have to choose which permissions you're going to ask for carefully, to avoid overloading users.

Android made a bad decision by making phone apps needing permission to know if the phone is active, then compounded that by tying it into device ID and who you're calling.