As the platform owner, they explicitly reserve the right to do this - see also Meta, Google, Amazon, etc.

Apple collects data, but they usually keep it for their own use, that's the difference.

Third parties trying to do the same level of collection and also share it with partners is the issue. As such, the platform owner putting constraints on them by applying rules related to privacy shouldn't surprise anyone.

If it does, you're not paying enough attention.

Have you ever read a comment in favour of Apple Store ads? Every time the topic is discussed here the opinion is very negative.

What I said it’s that I don’t find it surprising that people generally dislike the App Store but that they also aren’t against limiting tracking from apps.