It makes it significantly harder to track what's happening. For instance if I'm snooping metadata on two people communicating using some end-to-end encrypted system (say mail with pgp), then if I see fucking enormous messages I know something interesting is going on. If I see only small messages I may not: I also have to notice the corresponding uploads & downloads. It doesn't make it impossble for snoopers, but it makes it harder.
Biting the hand that feeds IT
