Was this really the main obstacle for donations involving Visa? Does forcing the Icelandic arm of Visa to accept donations mean that Americans will be able to donate to Wikileaks? It seems farfetched that an international company as large as Visa would actually follow these orders, seeing as they probably want to protect themselves from leaks involving their own interests.
If a company has a branch in a given country, that country can hold the local branch legally responsible for the actions of branches elsewhere, including non-compliance with local rulings. Unless VISA wants to close VISA Iceland (Valitor) completely and write off the entire country, they either have to win their appeal or comply with the ruling.
> It seems farfetched that an international company as large as Visa would actually follow these orders, seeing as they probably want to protect themselves from leaks involving their own interests.
Not at all. It is just about which is most valuable to VISA. Not losing the Icelandic market or complying with the wishes of the US government.
This is the reason why not just European companies pay up when fined by the European Court. You have the choice to either comply and pay the fine or to leave the country (perhaps getting all your assets there confiscated).
It might be worth leaving Iceland since it is a quite small country. It all depends on how much complying with the US government is worth and how big the PR hit of leaving Icleand is.