Earlier quoted context omitted.
In that scenario, the quiet guy doesn’t realize that there is a cable guy standing behind him listening as well.
Mail is not that private, that is not the point being argued, and why I offered the street conversation example. From the moment you communicate with someone else, you've lost control over the information. But there's a huge difference between that, and having every word you write plus all the info that can be inferred from that, recorded, stored forever, analyzed and re-analyzed, sold, exploited, misused, etc, by a…
I assume that your cellular carrier and cable company are monetizing any bit of data they can capture and selling it for pennies to all sorts of parties.