AT&T isn't just an ISP. They are a top tier carrier. I would hope that the same rules apply.
This is called "double dipping". These providers are not supposed to be able to do this according to the common carrier rules. The subscriber pays and they get their allotment. Any other payments to "overlook" a data cap that are made by a third party violates the common carrier rules because it creates an unfair advantage for large companies. They can afford to pay a fee to basically make the little guy penalized (having the little guys data count against the subscriber). If the subscribers complained to the FCC this pilot project would be stopped dead in its tracks.
I fear though that the only people that would care are the technically minded subscribers. The others would be snowed by some marketing speak.
My intent was to show that people here moderate for a for-profit business all the time.
People moderate for
Companies like the ones you mentioned are all about not paying someone to do what to you and I would be something simple: Moderate the discussion. They also don't want the readership doing the moderation because that could potentially be at odds with the publications owners views.
"When the going gets tough, the tough get empirical." -- Jon Carroll