I'm not into the law, and there might be differences in each country's legislation, but I'm concerned about this. Am I considered a co-worker of the services I advertise? If the authorities strive for shutting down one of these services in my signature and avatar, am I subjected to this activity as well? If the CEO of either ChipMixer or Betnomi (as examples) is proved to be guilty, am I guilty as well?
Let's say you are and the CEO of the projects were caught for illegal service providing. How will whoever the authority it is, will find you. You are in an anonymous forum, most likely browsing using TOR. It's not easy to find you.
May be a lawyer will tell you better. But personally I do not care. I live free, die free. It's hard but bitcoin gave me an opportunity.