Of course, over time we put less metal into our infrastructure (plastic pipes, fiber optic cables, etc) but there is still a lot of metallic infrastructure in place that could be adversely affected by DC fault conditions.
How can any nation grant right over something outside its sovereignty?
Indeed! It seems to presume a lot. Perhaps this just regulates the behavior of US companies mining asteroids.
"Anyone attempting to generate random numbers by deterministic means is, of course, living in a state of sin." -- John Von Neumann