I just discovered BitTorrent DNA today... Turns out that it had been covertly installed on my machine. For once in my life, I'm thankful for Windows Firewall's constant pestering. So what is DNA? To quote BitTorrent: "DNA is a content delivery service that uses a private and secure managed peer network to give you faster and more reliable access to your favorite websites and videos." (Source). To (cynically) rephrase that: DNA's a way for content hosts to avoid costs by forwarding them to the end-user.
Until recently, I had a (theoretically) unmetered connection. As such, I wouldn't really have minded something like DNA, had I been told about its existence. Hell, I'm more than happy when I'm legally torrenting to give back when I'm taking. My personal problem lies with silently installing services in the background to do this. It seems to harm the user (directly costing them in bandwidth fees) and the reputation of the content providers and the BitTorrent corporation themselves.
My proposed solution to content providers? Find a distribution method you can afford.