It's free open source code. Donations help, but the FBI tell^H^H^H^H politely asking the payment companies to stop processing for them isn't going to stop anything. People will work on it for the love of the project.
Yeah, but they can still make it illegal to work on such projects (like they had crypto algorithms illegal to distribute outside the us), imprison the programmers if they insist, close down the project site, etc.
Of all the things it's possible to clamp down on from a legal standpoint, writing code is probably impossible. Such is the way of the internet, routing around the censorship damage :)
