I must admit, I don't quite understand this. I'd wager that the only reason Spotify was able to offer a service in the early days at all was because it leverag

I must admit, I don't quite understand this. I'd wager that the only reason Spotify was able to offer a service in the early days at all was because it leveraged listener's bandwidth. Even if it could, using P2P will have directly reduced the costs/number of adverts that would otherwise have been required. That's a perfectly reasonable tradeoff, and I guess that the vast majority of users would rather have a monetarily cheaper service.