this post was submitted on 12 Feb 2024
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Yeah E2EE doesn't really matter much if your notification service routes through Google or Apple. Which they pretty much all do if you have push notifications enabled.
E2EE does help. Notifications can include the content of the notification but they don't have to and it's generally recommended to send a notification telling the device to launch the app in the background to check the server for new content. The app will then decrypt the message and display a plain text notification that is not sent to any servers.
If you're worried about metadata leaks, you can delay delivery by a random time interval.