A "House of Cards" is a wonderful English phrase that it seems is now primarily associated with a Netflix political drama. However, its original meaning is of a system that is fundamentally unstable. It's also the term Sarah Thiele, originally a Ph.D. student at the University of British Columbia, and now at Princeton, and her co-authors used to describe our current satellite mega-constellation system in a new paper available in pre-print on arXiv.
GPS Satellites are MUCH further away then LEO. GPS orbits around 20,000km, LEO is 400km. There is no way a non-nation state can get there, let alone the difficulty of actually intercepting those satellites. It’s physical possible, of course, but not easy.