I have the impression that ever since Snowden happened, yes. Any mention of a non open source OS gets accompanied by remarks about NSA, FBI and co.
https://igurublog.wordpress.com/2014/04/08/julian-assange-de...
http://www.theverge.com/2013/12/20/5231006/nsa-paid-10-milli...
https://www.quora.com/Is-there-any-backdoor-left-in-Unix-or-...
https://blog.cloudflare.com/how-the-nsa-may-have-put-a-backd...
On one hand, we've been privy to some of NSA's operations, on the other, there is still a lot left to be disclosed, most will of course, never be out in the open.