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FBI Extracts Suspect’s Deleted Signal Messages Saved in iPhone Notification Database
(www.404media.co)
This is a most excellent place for technology news and articles.
By not having Google Play Services, isn't this prevented?
If you don't use Google Play Services, you don't get push notifications, so yes. Libre reimplementations of Google Play Services such as Gapps etc. or alternative push notification providers do not circumvent this issue, except possibly self-hosted push notification providers. This approach is really rare though and limited generally to very few apps.
I don't use Play Services and still get push notifications from Signal, so they're clearly using an alternative implementation.
You might be getting pull notifications, that's generally the workaround for push notifications being disabled - it generally increases battery usage because it forces the app to stay open in the background.
Molly supports unified push
That would make sense.
websocket based push notifications is still called push notifications in signal. this is the first time I hear the term "pull notifications", I don't think it's widely used.