Look up what the Apple's tracking-prevention policy prevents for users that don't opt-in to tracking. You cannot ban generating device or user identifiers with OS permissions alone. Prevent using the built-in ones, sure, but fingerprinting or otherwise creating device or user IDs to share with 3rd parties and other apps? I'd love to see what a permissions model would look like that could do that automatically, at the OS level. I don't think such a thing exists. Not for any app with enough access to the system to do anything remotely useful in the first place.
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