I was making that point, and ALSO the point that the perceived slight was purely in the eye of the beholder, I edited my comment to add a link to a 2011 academic paper on Spotify's P2P architecture that proves that they were not being cagey or secretive about this part of the design, it was already "out there" and if it just so happened to first cross this guy's radar when he saw the outbound traffic on his own network, he can't really blame Spotify, he can only be indignant at his own ignorance.