The FBI isn't a world super power, but the government they are apart of it. What can country X do about the FBI hacking their citizens if the agency has the backing of the United States? Nothing really.

That is basically a act of war then isnt it? Definitly not "legally hacking the whole world". Even if they legally hacked my computer, they illegally hacked into my computer. I see no reason why i couldnt sue them about this (sure that would be laughed at, but still no is no "except the U.S. wants that" written on my local law)

Also please go tell this to Russia or China or any other country the U.S. heavily depends on for their economy.

Edit:// Except for keeping the dollar stable because that would influence our economy as well, i dont see how switzerland is depending on the U.S. a lot. China, that would be a real issue tho.