I have installed Google's apps to view online spreadsheets on a new iOS device. I then receive an email from Google: "Your new Device doesn't have the latest Google apps".
While I understand and expect that the data on Google Docs and Sheets is far from private, it is also well within reason for Google to record what I download from them and what I do not. If the Google app realizes I have a new device, it makes me wonder what else it is accessing.
How do I assess and measure how much privacy has been ceded to Google? For example, I have not installed Google Maps, because I find it creepy in an Orwellian sense, that it records where you have been.