Re: I could never
Unless of course , you were worried about the US turning off access to the GPS if they did'nt like what you were upto.. like say.... independent military action...
Or perhaps refusing to sell an island or two which the US happens to fancy at the moment? Or may be being a host to a telecom company which is getting a bit too succesful? Or something like refusing to hold a ship which didn't break any of your laws, but is owned by a country the US does not like? Or being a little too efficient at making aluminium and steel?
A capricious and arbitrary external power, which is not accontable to any outsider in any meanigful way, is not a very good sole provider for a safety-critical system or resource. Which at this point GNSS arguably is.