Acually T they can and do ban servers connected to the internet which provide access to illegal material so the USA authorities can disconnect servers! I do not know the exact mechanics of it but I understand it is quite complicated. The ILS is probably still on line through the good will of the government of the host country. It is the case that in some countries Fair Use laws are much much more liberal and it would not be Legal for the USA to act in these places. Hence they do not because they cannot.
A good case is material online in Holland and Findland both in the EU - and bound by their stict rules. Here I mean really naughty stuff warez etc!!