I will revise the section on criticisms of biohacking when I have time. Now, I would just say as someone who has used mail-order DNA synthesis services in academia (ATUM, formerly DNA 2.0, is the largest company doing this now), that no such service would never send arbitrary DNA to anyone who has money. Even small genes up to ~5k nucleotides are quite expensive. Complete de novo gene synthesis of any genome larger than a virus or the absolute smallest bacterial genome would be prohibitively expensive. Even granting that in the future de novo synthesis will get exponentially cheaper and faster, no company will send smallpox genome, ebola genome, or some unknown sequence without verifying the person or institution ordering.