A Simple Explanation 

Gruber, on Readability’s app rejection:

Maybe I’m missing something, but these guys claiming to be surprised and disappointed by Apple’s insistence on a 30 percent cut of subscriptions when their own business model is to take a 30 percent cut of subscriptions strikes me as rich. And how can they claim that Readability isn’t “serving up content”? That’s exactly what Readability does. What they’re pissed about is that Apple has the stronger hand. Readability needs Apple to publish an app in the App Store. Apple doesn’t need Readability.

As hard as it may be to swallow, he’s right.