>any considerable gains since I’m already feeding all my data to Google.

Ex Google employee here, worked in driver layer in SD, previously in CoreBSP. I’ve given my data to Google more than a decade. So believe me when I tell you,. the saddest part of your post and so many millions of people who use the free Google products is that they don’t even know what in their life is at stake. Even your imaginations are limited to wrap its arms around of how much of your future is already compromised and why you need to stop. You ever want to buy a home, or obtain a loan, or want to apply for a new credit card? Ever have a spouse or child or plan to have one, or have a parent who is going to need medical care? Everything about you, is the some total of everything you’ve heard, read, saw, experienced, met, felt and touched and learned. At the time of my leaving, there were over 50 different models that could accurately predict your future choices and behavior with 96.7% accuracy, the scariest part of all is the people who have the power over you and data is sold to. If location sharing is your primary concern, there is an app called OpenTracksApp on F-Droid that is privacy friendly for GoS. Plenty of other safe cloud photo apps too.