

Android apps are sandboxed
FWIW, they’re not sandboxed from google play services:
The Play Store Services process has access to your precise location at all times, the motion sensors, networks, hardware identifiers (including IMEI), contacts, passwords, the entire storage space, call logs, access to other apps’ data, and more.
Accordingly, google would have access to the Signal data on your phone. However, I don’t know whether the encryption would provide a measure of protection against google. GrapheneOS by default does not use google play services, and provides a sandboxed version for people who need the functionality.











Yes.