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Your Apple ID country has a lot of implications if changed (certain app access will be available/restricted, payment methods, etc). You aren't going to be able to identify a user specifically, but you could detect if a user is currently traveling internationally or may be a frequent VPN user.

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This is the case anyways with the user’s IP.

The problem is that combining the two would actually give you significantly more information than either individual datapoint. A mismatch between Apple ID region and IP region will very reliably identify a subset of users (either expats or travellers).

Or VPN users, which is still relatively small.

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