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What is the point to “backdoors” or “trackers” on Google Play Services when 99,9% of people use some variation of Android where Google has privileged access to everything on the device via privileged Google Play Services? Meanwhile on GrapheneOS Google Play Services are sandboxed.
Google Pixel devices have proprietary firmware which is made by Google maybe there are backdoors or trackers in that and it has their SoC AKA Tensor so maybe they have hardware backdoors in that too? There are NO LIMITS to being paranoid about something.
All of the apps that someone install on GrapheneOS are STRICTLY sandboxed so they only can do what you let them to do.