"Sandboxed" Google Play still gets everything that the other apps in the same profile offer up to it / to Google. I don't understand how you're gaining any privacy as a practical matter. The issue isn't GApps' privileged access to the system, it's that other apps send your data to Google via Google Play Services.
To take some examples, MicroG stubs out the analytics and ads APIs. Your "sandboxed" Play would send that data to the mothership and return with ads.
To take some examples, MicroG stubs out the analytics and ads APIs. Your "sandboxed" Play would send that data to the mothership and return with ads.
https://github.com/microg/GmsCore/wiki/Implementation-Status
https://github.com/microg/GmsCore/blob/32bc8954ff872d0e1a05d...