They don't even need to build anything. The code exists. The secret is out, my friends! All you do by restricting things like WhatsApp is deny secure communica

They don't even need to build anything. The code exists. The secret is out, my friends! All you do by restricting things like WhatsApp is deny secure communication to law-abiding people and make the criminal's life slightly more inconvenient if he wants to be able to communicate securely. But you can't stop it.