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ICEBlock climbs to the top of the App Store charts after officials slam it
(www.engadget.com)
This is a most excellent place for technology news and articles.
All push notifications go through APNS on apple. That's Apple Push Notifications Service.
APNS requires the device to authenticate with it and can uniquely identify the device by an id. Its how it sends messages to devices.
Firebase cloud messaging acts the same way for true push notifications.
You don't need to audit a device using APNS or FCM on Android to know that it is not anonymous.