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Apple's ad program being referenced is present in its App Store, News, and Stocks apps, as far as I know. That said, Apple also uses their platform to push advertisements for their services/credit card, via push notifications [0], as well as in the settings app[1].

[0] https://9to5mac.com/wp-content/uploads/sites/6/2019/11/IMG_0...

[1] https://www.reddit.com/r/Android/comments/poegzl/i_was_just_...

It's the app store paid placement, they specifically tout their lack of cross-site tracking.

Primarily the app store, which has a number of placements with sponsored content.

App Store paid search placement