content: By definition "so people couldn't stream videos in HD" is throttling. noun  1.  a device controlling the flow of fuel or power to an engine.  "the engines were at full throttle" By the very definition of the word, the ability of T-Mobile to not allow video to stream at HD, would be controlling the flow of fuel, in this case speed of traffic, to an engine, ie your browser. Optimize has a totallly different meaning than what they are stating as optimize is "rearrange or rewrite (data, software, etc.) to improve efficiency of retrieval or processing" and LOSING the ability to stream in HD would not be IMPROVING anything other than their bottom line. This is clear cut throttling, and all the pathetic attempts to dynamically rename it to sound like something else is just that, pathetic.