

Physical surveillance of mail is incredibly expensive, slow and subject to a bunch of regulations.
It also doesn’t consistently work.
Electronic surveillance of communications is incredibly cheap in comparison, near instantaneous and an evolving new technology that’s loosely regulated if at all.
It also creates a 1:1 copy of the transmission for interpretation at a later date.


The threat is that someone who learns the material facts of your accounts interactions around the internet would (correctly) recognize that it changed hands and if that person were some kind of cop they would have cause to investigate further, possibly uncovering other facts about you or your activities.
The point is that you’re breaking one of the cardinal rules: “keep your head down and your nose clean!”
Not gonna fight about it, just making it known.