After a letter to DOJ by senator Ron Wyden Apple confirmed that governments were requesting push notification data to surveil users.
"In this case, the federal government prohibited us from sharing any information," the company said in a statement. "Now that this method has become public we are updating our transparency reporting to detail these kinds of requests."MacRumors
Push notification statistics was used to match Apple ID with patterns of notifications for specific apps (for example, messaging apps). If app uses end-to-end encryption, contents of the messages could not be read by governments, but it is still possible to identify specific users by usage patterns.
Both Apple and Google were providing this data to governments.
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