PayPal's terms of use do not permit soliciting crime. Wikileaks solicits the holders of US security clearances to violate their non-disclosure agreements. That is a crime.
Some people think it should not be a crime. But it is. Some people think that it matters that WIkileaks says that they do not ask for submissions. That matters about as much as a mob boss saying that he didn't ask anyone to shoot so-and-so, just that wouldn't it be fortunate if someone did? Wikileaks model is predicated on breaking NDAs, and based on what their cite on their front pages, breaking NDAs on US classified information is their biggest product center.
