This is a different issue, though. Of course automated systems and the occasional human being are going to read through our email. But the issues brought out in the article, such as certain political agendas being inserted into your mail based on the content of your conversation, are a step up from spam filtering or a nosy sysadmin. Sure, it's just a logical extension of advertising that already happens, but has an intrusive feel about it. Certainly a step up from the stuff that happens on current free email services.