There's going to be a huge debate about internet censorship if ever they fine signature campaign participants, they first have to prosecute and fine the domain registrar and the host hosting Chipmixer, and Google for indexing Chipmixer and everything related to why Chipmixer is online.
I don't know if there's a past ruling about liability being a third party on a site considered by US Justice Department and FBI as an offensive platform, but first, they have to prosecute and render a decision on Chipmixer before they will have long deliberation on internet marketing, which will involve internet giants like Facebook, Google and everything associated to the internet.