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 are covered by this ruling, and how are they going to implement this.
Well I'm sure some alphabet agency would have the authority to go after internet forum members if the government wanted to go that far, but as has been pointed out the funds that were used to advertise Chipmixer were minuscule in comparison to what they've already seized. And frankly I just don't think that's going to happen. Campaign participants rented out their signature space to a company that presumably they believed was doing business legally--but that's my opinion, and I don't have a good grasp of what the law is for stuff like this.
It'll be interesting to see what kind of defense the accused owner puts up. Hopefully he's got enough money to hire a good lawyer after all those assets got ganked by the cabal of governments behind the investigation. I say let justice take its course, but I'm also aware that defense attorneys are there for a reason, i.e., to challenge accusations that may or may not be true.
But it ain't looking good right now.