It looks like AT&T is taking a page out of the T-Mobile book.
AT&T borrows T-Mobile Binge On to launch new Stream Saver feature - TmoNews
AT&T borrows T-Mobile Binge On to launch new Stream Saver feature - TmoNews
I don't think that's how it works. They partner with these providers (YouTube. Netflix, etc.) to work with the feature. They aren't just doing it on their own. This way content is properly delivered.The one problem with all these plans is that the initial connection is made at HD speeds - then the phone switches to 480p, but the server is still sending HD data, so you spend most of your time watching the video buffer. At least AT&T has made it easy to turn the feature off if you're willing to spend the data.