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US Senator revealed that government agencies worldwide request push notification records from Apple and Google to spy on customers. Governments can request metadata involved in push notifications, which can then be analyzed to provide insights on the user. While the data needs to be reviewed before it is provided, it shows that there are a lot about the devices, applications and services we use that can reveal a lot about ourselves.
Ars Technica · Apple admits to secretly giving governments push notification dataApple to update transparency report to break out push notification data requests.