I didn't know we were talking legality. The point raised above was "So what if they undercut Spotify, maybe Spotify should take 30% less profit when they sell u

I didn't know we were talking legality. The point raised above was "So what if they undercut Spotify, maybe Spotify should take 30% less profit when they sell using Apple channels?" I was trying to point out that it is economically unlikely Spotify has a 30%+ profit margin. Legal problem may exist in different areas. Ianal, but I wonder about Spotify's claims, refuted by Apple, about locking them out of watch and app store rejections. I am also interested in the practice not only requiring payemt though Apple, but banning any mention of other ways to purchase the same product.