"Their platform, their rules" – there are many people who say this, especially on HN.
Or not building products which collide with platforms.
As a general rule, if you have to use offensive lawsuits you are not smart enough to do it cleanly.
This is true in business and everywhere else
The rules applies to Spotify, but not to Apple music. Apple should make Apple music a separate entity, and make it pay 30%.
Apple is free to make a music player. But its music player should abide by the same rules as other players in the market.
Either Apple Music has its income cut by 30%, or no one does.