Snowden, similarly, signed a substantial non-disclosure agreement which was a condition of his employment with Booz-Allen.
Of course, considering the NDA was a condition of his employment, he was paid for his work that he could not have done had he not signed said NDA. What did he expect would happen after he received his money and then opened his mouth?
That's my whole point - I've never seen Snowden play the part of the grand victim like Wynn-Williams appears to be doing. He did his job, discovered some bad behavior, and released the information at great personal cost, a cost that he seemed willing to accept (he's obviously not happy about the consequences, but he knew what would happen). I haven't seen blog posts from him about how Booz-Allen "stole his voice".