Because the average person has no idea how to use it?<p>Because <i>both parties</i> have to have it set up for it to work?<p>Because setting it up <i>wrong</i> will grant you no protection?<p>Because it just encrypts the communications in transit but when you&#x27;re already under suspicion they can grab your computer, which has the unencrypted files on it?<p>Because in a setting like this (trader&#x27;s work computers) you&#x27;re often not even allowed to install <i>any</i> software?