I'm sick of Google being hailed as a magical place you'd have to be crazy to leave. Look: Google sucks. All technology companies suck, albeit in different ways. It's possible for a talented, rational person to hate working at Google, and I don't care for all the Googlers on HN saying otherwise.

Sure, I'm not suggesting that was the only factor. Only that, I bet it played a part in tipping the scales? :)

Also, while there are plenty of shops using Python, Dropbox is certainly one of the ones seeing an appreciable amount of success, no?