I wasn't saying that I would personally take that risk and violate an NDA, just that in a company that employs thousands of engineers and tens of thousands of other employees, chances are usually good that someone is willing to spill the beans to people outside the company. It is the same reason reporters are able to get scoops from inside the Pentagon or White House or hear about internal corporate issues before they are announced. People like the feeling they get when they share information that others want to hear and don't have privileged access to. Adding a layer of anonymity through an Internet forum makes people even more willing to take that risk.Not sure you understand how NDA's work but seems like you've got the answers you're looking for so...all good.
Again, I wouldn't do it myself, but that doesn't mean no one would.