I turned off both "background data usage" and "rub in background" on #facebook app on #android and yet still I get notifications about posts I don't even care about 😒
@0xZogG Most Android applications don't create their own connection to some app server for notifications. That would mean 20+ open sockets and constant data. Even without notifications e.g. by TCP keepalive packets. Not so good for mobile plans in many countries.
Instead Google offers a way to signal them a "there is something for you" via just one connections to all apps. I won't contain the actual data, but just "something is for you".
That way apps like Signal get notified, get out of background state, use their secure (?) method over their own socket to get the real data, and go back to sleep again.
That's btw the reason these apps use MORE battery if they run on some un-googled Android. Because then they regularly awake.
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