Apple sells the computer. There is a reason Microsoft got prosecuted for those 90s contracts and not Gateway. OEMs have the right to decide what software they install at the factory.
Apple Music is available in the Google Play Store but I don’t know of any credible accusation that Apple has tried to get Google to kick Spotify out.
Nitpick: Apple Music competing with Spotify is remarkably similar to the Microsoft case. (Epic's case is weaker.)