> For this particular case (the user ID) they explicitly assert that they are also subject to it. It's kind of a ridiculous claim though, because Apple is the

> For this particular case (the user ID) they explicitly assert that they are also subject to it. It's kind of a ridiculous claim though, because Apple is the only company that has access to your device UUID (on iOS). 3rd party services aren't allowed to access the device UUID, so they get the IDFA. Apple doesn't need to use the IDFA, they just use the UUID which the user can't change, and link it to your Apple ID. Also, Apple really really wants you to have an Apple ID. iPhones are almost useless without an Apple ID (no way to install software). So it's not like you can opt out of Apple tracking you by not signing in with your Apple ID.