On the side of 'level playing field' they do of course still have a point, just like all the anti-trust stuff we had/have with Microsoft and Google. It does make me wonder a bit why this hasn't been involving other companies like Amazon and Facebook. (or, why it hasn't been suggested as widely as it is now)
I do wonder about the technical aspect of those store denials and watchOS problems; other streaming services do not face the same issues/pressue, so what makes spotify so special? They app is a bit crappy (it's not very good at maintaining/restoring state and doesn't have the most consistent UI), but other than that, it doesn't do much different things when compared to others (like Deezer or Tidal). Putting it as a "Apple Music vs. Spotify" thing is a bit weird too; while it might make sense, it doesn't make sense if it's just that and all the other streaming and buying services are free to do what they want. It's weird stuff.