There is something we're not being told here. Because the reasons all these commenters are throwing out make zero sense.
You're assuming the existence of a 'need'. Part of my point is that there doesn't have to be any 'need' for additional revenue beyond the revenue itself.
It also seems like you may be assuming that the person or people responsible for this and other similar decisions are incentivized to consider all of Apple's revenue as opposed to a specific subset of it, which I suspect is unlikely.
Fiscal 2022 Services revenue is 77 million and iPhone revenue is 220 million, so it's not there yet, but it's beating iPad (29 million) and Mac (40 million) combined which is nothing to sneeze at.
I don't think that Apple discloses App Store revenue separate from Services revenue
https://sixcolors.com/post/2022/11/apples-fiscal-2022-in-cha...