To address Paulf and Hellwig:
YouTube probably would have jumped all over Binge On but couldn't because most of their data streams are encrypted. This resulted in them not being able to join Binge On and ultimately them complaining due to Binge On throttling. T-Mobile never optimized anything. Essentially what they did was throttle both partner and non-partner connections to 1.5Mbps and hope the provider would notice and reduce the resolution of the video. Should the provider be unable or unwilling to do so all you got was more buffering or stuttering of the video. This is why everyone said T-Mobile was flat out lying about Binge On optimizing anything.
What upset the non-partners/users is that they were being throttled AND having it count against data caps while Binge On was enabled. What should have been done originally is what they are trying to do now. No throttling but using data for non-partners and throttling and free data for partners.