[deleted] The really powerful way to stop Google from seeing one's photos is to not use Google Camera. The really powerful way to stop Google from seeing one's contacts is to not use Google's dialer. The really powerful way to stop Google from seeing what one types is to not use Gboard. The really powerful way to stop Google from knowing one's whereabouts is to not use Google Maps for navigation.
Various people suggest various tricks and rituals by which they hope it is possible to share data with Google apps while ensuring Google doesn't get their data.
But on the one hand those suggestions often overlook that many of these applications inherently contain code to buffer data during brief network outages, so turning network access on and off is unlikely to thwart those apps from sneakily sharing data if -- hypothetically -- they contain code to do that.
And on the other hand some Google apps refuse to run without network access, without a Google login, without IPC access to various parts of Google Play, etc.
Do the tips and tricks and rituals work? Would IPC filtering stop undesired assumed-but-never-demonstrated sneaky leaking via IPC while leaving the apps usable?
The really powerful way to avoid Google misusing one's data is to not process the data with Google's apps.