Say I have Google Camera installed with network permissions revoked. Say I also install Play Services which does have network access. Would Google Camera be able to share data about my pictures to Play Services which would then phone home to Google?
Say I have Google Camera installed with network permissions revoked. Say I also install Play Services which does have network access. Would Google Camera be able to share data about my pictures to Play Services which would then phone home to Google?
Yes. Apps can consensually trade information. So if play services is connected to the network, it can share information it receives from other apps.
The only way to isolate an app from communicating is to put it in its own profile either a work profile or a secondary user.
Simply disabling network access does not prevent the app from talking to other apps that do have network access. You need to be careful based on your threat model
You can also remove permissions other than camera/mic and storage using AppOps mechanism, and cut off internet access with a capable firewall like NetGuard or Invizible Pro if installed on main profile.