Apple tries to counter that the problem is Spotify. It's Spotify that is money-hungry, Apple claims:
Underneath the rhetoric, Spotify’s aim is to make more money off others’ work.
The only problem with this argument is that Spotify is just one example. App publishers of all sizes have expressed grave dissatisfaction over this issue. Ultimately, this has led to a poorer experience for Apple's own customers in the form of higher fees for in-app purchases or weird, convoluted checkout flow that requires you to goto your browser to finish a transaction.