Yves, great post. Looks like you are missing a link in the first paragraph where it says — [Read the full article here].
This guy predicted the Yahoo breach 2 years ago — https://twitter.com/lourabon/status/779160170903445504. I’m sure it was on Yahoo’s radar as well.
The plot thickens… Yahoo secretly scanned customer emails for U.S. intelligence — sources via http://www.reuters.com/article/us-yahoo-nsa-exclusive-idUSKCN1241YT