Earlier quoted context omitted.
I strongly agree. Since Snowden himself is presumably in Russia, the U.S. government is effectively attempting economic sanctions against him. Their method is to scare anyone that might send him money with a lawsuit.
He's just released a book, I wonder how it is set up, can he earn the money from it or not?
It's possible that Macmillan paid him an advance and so he already has the money. I don't know if the feds can do much in that case.