WTF is zero rating?

It turns out that the entire concept of zero rating contradicts the notion that data caps were necessary in the first place. Bandwidth isn’t unlimited, but clearly there’s enough that carriers don’t need to charge for using enormous amounts of it — you can stream ten times your cap amount via zero-rated services and they won’t say a thing. But go a kilobyte over with a messaging service or game download and you’ll be charged. This means cap amounts, and the ways they’re tracked, are completely arbitrary — they have nothing to do with how much bandwidth is actually available, or how much you actually use. – Devin Coldewey, TechCrunch