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A comment on iOS 13 app tracking alert has dramatically cut location data flow to ad industry. Parent comment

Re:iOS 13 app tracking alert has dramatically cut location d... by VintageCool on Monday January 13, 2020 @09:53PM (#22041365)
There is an IDFA (ID for Advertisers) and an IDFV (ID for Vendors).

The IDFV is unique per developer; the IDFA is unique per device.

The device user can reset their IDFA at any time, and if the user disables ad tracking then the device returns 00000000-0000-0000-0000-000000000000.

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Re:iOS 13 app tracking alert has dramatically cut location d... by banachtarski on Monday January 13, 2020 @10:12PM (#22041462)
Yes but in practice, users never do, and when they do a reset, fingerprinting employed by most (all?) ad exchanges can make the association without issue.
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