Which has nothing at all to do with this.
Of course it does. People are acting shocked and outraged that someone is possibly (although almost certainly not) reading their email. Is it really that employees of these specific companies are reading their emails that concerns them? Would they rather it was a totally random person they knew nothing about? Of course not.
It's always been the case that your email was potentially being read by someone other than who you meant to send it to. I find it unlikely that the odds have even significantly changed. These companies are probably dealing with billions of emails per day. Probably a few times a month they pick a few dozen to have a human being actually look at. So the odds are somewhere on the order of 1 in a billion that one of these employees actually read your email.