To me this doesn't seem like it's against network neutrality, after all you get a lot of bonus in return for this throttling with a much higher data cap. Furthermore for most people it's not that much of a degradation, if you are watching it on a mobile device how much better is 4K going to look as it chews through your data allowance?
Yeah, remember, NetNeutrality means you can't discriminate based on
...when fits of creativity run strong, more than one programmer or writer has been known to abandon the desktop for the more spacious floor. - Fred Brooks, Jr.