They don't anymore [1]. CDNs simply got too cheap to have a warrant a more complicated setup, that did not work on all their clients. [1]: https://techcrunch.c

They don't anymore [1]. CDNs simply got too cheap to have a warrant a more complicated setup, that did not work on all their clients. [1]: https://techcrunch.com/2014/04/17/spotify-removes-peer-to-peer-technology-from-its-desktop-client/ https://techcrunch.com/2014/04/17/spotify-removes-peer-to-pe...