"Furthermore, it highlights that the companies' embrace of complex encryption techniques is making it even harder for GCHQ to spot potential threats in the "204

"Furthermore, it highlights that the companies' embrace of complex encryption techniques is making it even harder for GCHQ to spot potential threats in the "204 million email messages, 100,000 tweets and a million Facebook posts" sent every minute." You mean just like it is hard to spot potential threats in physical mouth to ear communications? Why is it okay to look at internet data for threats but not okay to put listening devices on every person? Seems like it's the same flow of data coming in either way.