Also, if I wanted to print a gun, there are thousands upon thousands of older Creality and Prusa printers that I could buy used. My CR-10 isn't connected to the internet, it's running a FOSS Marlin release.

It will be very strange and funny if there is a registry of 3D printers before there's a registry of guns, and for that matter, it will be very funny if it becomes easier to buy a gun than a 3D printer, with the reasoning being that 3D printers can print guns.