iOS 13 app tracking alert has dramatically cut location data flow to ad industry

Re:iOS 13 app tracking alert has dramatically cut location d... by madeofpalk on Monday January 13, 2020 @08:02PM (#22040697)

> By default, users have a unique tracking/advertising ID attached to their phone.

My understanding is that this tracking ID was a replacement for apps being able to obtain the devices serial number. The tracking ID is unique per developer (edit: not true, it is unique per device, so multiple devs can build a profile on you) and can be reset by the user at any time.

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Re:iOS 13 app tracking alert has dramatically cut location d... by KMnO4 on Monday January 13, 2020 @08:41PM (#22040993)

I don’t believe the IDFA is unique per developer (assuming I’m understanding you correctly).

I use analytics in my company’s app and I get my team to send me their IDFA by downloading a free app from the App Store. The IDFA in my analytics is the same IDFA in the 3rd party app.

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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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