People already do this, at least if they're smart.

Yeah that's kind of the idea. If it's harder to communicate about doing illegal things, it's harder to do illegal things.

That's a feature, not a bug.

This isn't about just inhibiting illegal things, constant surveillance has a chilling effect on many subjects

Yes, and the greater good would be served by having a chilling effect on people in these positions, even if it means with the unintended consequences.