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For educational purposes: When apps ask for access to your entire photo library they are not asking for access to the pic you are uploading. They are asking for access to your entire photo library, which includes geotags, faces, and timestamps. It’s a dataset, not just photos.
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…in reply to @axbom
I’m not saying all apps use this data but the binary trait of photo access is a privacy issue. Apple made it slightly better in iOS 11 with the option of write-only access, but we still have a long way to go for privacy by design here.