I guarantee you any company doing what Spotify does would love to cut out the middleman.
The problem is that middleman owns near-everything your users want.
They hold all the cards, they can just say "hey, either you do X or you don't get our music library" and now your customers don't have ~95% music library they wanted.
I'd wager Spotify's reluctance to "just let you listen to fucking music" might be related to that, if it was just API you could integrate with any player you could make indie-only Spotify equivalent that just... uses Spotify API to play whatever is not on it.
The problem is that middleman owns near-everything your users want.
They hold all the cards, they can just say "hey, either you do X or you don't get our music library" and now your customers don't have ~95% music library they wanted.
I'd wager Spotify's reluctance to "just let you listen to fucking music" might be related to that, if it was just API you could integrate with any player you could make indie-only Spotify equivalent that just... uses Spotify API to play whatever is not on it.