From the Instapaper blog:
In retrospect, that was an overreaction. 9to5Mac’s statements, as much as they angered and scared me, did not constitute an opt-out. Furthermore, it was inappropriate to add a publisher to the opt-out list that did not explicitly request it.
I’ve now reversed that decision, and I’m sorry that I overreacted.
We are counting down to the final moments of this UDID debacle and paving the way to Apple's big September 12 event.
Wronged and still the first to apologize. You're the man @marcoarment.