Well, up to a point; there are plenty of laws which apply to anyone deemed to be marketing to the US, especially financial services and online gambling, and Megaupload got raided by the FBI despite being in New Zealand.

Thats true, but I don't know if that necessarily means U.S law applies to those countries, as much as allies will oblige in certain cases such as the ones you mentioned and Huawei. And when I say I don't know, I very much actually don't know