I strongly care about net neutrality, too. And I wouldn't personally care if they texted me with a "reply with 'disable' to disable Binge On" text message, but too many people with no clue of the ramifications might disable it.
You'd really need to force people to learn something that 98% of T-Mobile customers don't care about -- and I would find it annoying to be forced to learn something that I personally find obvious.
T-Mobile customer here! My plan supports BingeOn, and I received a text message from them with a link to a webpage with full details, including information on how to opt out.
I think they've handled this perfectly. No association other than a satisfied customer for 14 years.
Was this email or text? I'm on T-Mobile, and this is the first I've heard of it. Just searched my email and there's no mention of "Binge On", and I'm not seeing anything in my texts from them.
I am still on the classic Simple Choice plan, myself, partially because I don't consume enough video for BingeOn to be compelling, and partially because the new plan doesn't offer my current 3GB add-on -- I'd have to change to a 6GB add-on for more money each month. I don't use my 3GB as it is, so it doesn't make sense for me to switch.