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The key is: who is allowed to see the segment ID?

In Apple's world, Apple owns the supply side ad surfaces, Apple maintains the segmentation and mapping, and Apple mediates the demand side.

What does an advertiser see? Pretty much nothing.

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So Apple can do segmentation aka user tracking at a group level because it doesn't expose the group IDs. Yet, we as consumers don't have transparency into the segments we inhibit. I am not sold that Apple's segment solution truly respects our privacy compared to solutions that don't rely on user identity or store segments.

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