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Which are all values written by the camera. My camera will believe it's whatever time, location, and face I tell it.

The point by clarkmoody was that Apple would be signing the photos with their key to ensure those values are correct.

It would be basically the macOS Developer ID software model applied to photos.

You can set the time on your phone, and GPS spoofing is a technology that already exists -- or you could disable location services.

Cryptographic timestamps are a thing