Net neutrality or protection racket?
If peer to peer traffic is clogging the Internet and slowing down Skype calls, why not mark it as lower priority and do the download overnight? The software updates and Word of Warcraft files that use P2P quite legally aren't hugely urgent and that kind of 'when you’re not busy' bandwidth usage is how Microsoft makes Windows Update polite (the Background Internet Transfer Service doesn't work quite like P2P but some of the principles are similar).