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Apple admits to secretly giving governments push notification data
(arstechnica.com)
This is a most excellent place for technology news and articles.
interesting question, like others too have wrote.
My guess is that because most apps ask explicitly for permission (after the 1st install) unless they're permitted by the user they don't register for the push (just a guess :/
app makers pay for notifications, iirc (wrong?), they wouldn't want to pay for notifications that are turned off on devices