[Rami114]

Judging from http://hillbrad.typepad.com/blog/2014/02/trusted-proxies-and... it looks like opportunistic encryption is not meant to convey security, but rather add obscurity to in-transit plain-text traffic from the perspective of any in-between listeners (and he has no qualms pointing the finger at governments there).

Sadly he now seems to have changed his mind about the validity of this approach, mostly because users and devs alike dislike complexity in their decision process as to what is secure and what is merely obscured.