That would make sense if the only seed vendors were state owned. Most breeders that offer their seeds for sale are small time hippy-types that are very careful about breeding techniques. Check any seedbank and you'll see many US based one/two man businesses that are committed to organic natural seed production.
G13 was never really a Gov't created strain that was smuggled out. It originates from a woman, "Hashcake Patty" that heard of rumors that gov't was working a strain by that name and just called a simple afghani G13 for marketing. Most gov't strains are heavily sativa, whereas G13 is a solid indica. So don't deprive yourself of a "dick-in-the-dirt" strain.
agreed