Today I'd suggested an accidental approach. some hideously bad ad server / free chat app thing that just happens to serve as an anonymous store and forward network if tickled properly. Front it with actual small time spammers and scammers and give them far "better" software than they could otherwise afford.
Anyone remember a hacking group called the "Hong Kong Blondes"? Mainland infiltrators that would then warn dissidents. That perhaps turned out to be a media hack itself? I always thought the subject would make a terrific screenplay ;)