> The technology was already proven, i.e. The Pirate Bay and other torrent networks had already been a success for years.

Spotify showed that you could have a local-like experience with something backed by the cloud. BitTorrent had never really done that. The client wasn't that good, and you couldn't double click and hear a song in two seconds.

The way you said that made me think you might be remembering when it was partially P2P, but I don't remember the timeline, it was only used to save bandwidth costs, and they eventually dropped it because network operators didn't like it and CDNs became a thing.