Google Spotted Explicit Images Of A Child In A Man's Email And Tipped Off The Authorities http://finance.yahoo.com/news/google...160034446.html
Not that one in full possession of their faculties would seek to obtain such material, however as the article states:
“On one hand, most people would certainly applaud the use of technology to scan email in a case like this.
On the other, debate rages about how much privacy users can expect when using Google's services like email. In a word: none”.
So, when considering the “Hobby” and communications therein; the lesson here need not be explained.