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Apple Confirms Governments Using Push Notifications to Surveil Users
(www.macrumors.com)
This is a most excellent place for technology news and articles.
That's kind of how iMessage works, the Apple equivalent to GCM (Google Cloud Messaging) is called APN (or is it ANP? I always forget), and it sends a notification to the phone which then retrieves the message.
Be interesting to hear the perspective of the developers of Bubble Mini, since they just reverse-engineering iMessage.
https://jjtech.dev/reverse-engineering/imessage-explained/