Should add, the ruling is not really about the validity of the 30% fee.
What EU seems to argue is this:
1. Apple is in phone business, Spotify music. So far so good...
2. Then apple wants to get into the music business too. Now they have an unfair advantage since Spotify must pay 30% to apple while apple music "pays" 0%. So apple use their dominance in one area (phones) to get an advantage in a totally different area (music), which is a textbook violation.
What EU seems to argue is this:
1. Apple is in phone business, Spotify music. So far so good...
2. Then apple wants to get into the music business too. Now they have an unfair advantage since Spotify must pay 30% to apple while apple music "pays" 0%. So apple use their dominance in one area (phones) to get an advantage in a totally different area (music), which is a textbook violation.