I think this puts to rest those conspiracy theories about Chipmixer being a honeypot operated by government agencies.
I doubt this will affect regular users but there is a possibility they could try to shut down this forum. There is already a similar precedent when Deep Dot Web was seized by the FBI. It would be an overreach for them to go this route but if they really wanted to shut down BitcoinTalk this would be their best opportunity. As far as I'm aware Chipmixer didn't advertise anywhere else besides this forum.
I don't know how is this going to be possible, it will be a subject of a very long debate and when it comes to internet marketing everything is on impression and reputation and not on liability.
Some websites do not allow gambling drugs or porn because they want to have a good reputation on the internet not because they are going to be prosecuted, and there are sites that allow it and even dedicated their sites to it, we have porn sites and cannabis sites which are considered ban in other countries.
The FBI and the Justice do not have jurisdiction when it comes to internet marketing and third-party advertisement, if there is a ruling, the big question is who is covered by this ruling, and how are they going to implement this.