Theymos is like the president in the forum, and the staffs are other arms of his government in the forum. In this community, every regular member can advertise whatever they like, including scams, but the level of scamming is regulated, just like it is in every country. But aren't there going to be some questions about why the president allows such service to continue in the community? Well, since there is no law yet against mixers, Thymos will not yet rule out the mixers campaign in the forum. We can enjoy it while it lasts, but I really don't think there will be any laws in the future about stopping Bitcoin mixers. It's a regular saying now that mixing is not bad, and that's a very true statement. It's not bad for a person to choose to increase their asset privacy. Perhaps not every individual who chooses to mix their coins obtains the coin in an illegal way.
For example, if a robber, a thief, or all different kinds of bad people go to a bank, hospital, or higher institution, shall the government decide to shut down the organization because crime commuters are carrying out illegal activity there? The answer is no, they can only carry out their investigation unless it's a serious case before they can cease the place until their investigation is over. The government cannot shut down every hospital in a country just because one hospital treated a thief, or can they?
Your various analogies are a bit weird.
I am not going to proclaim to know all aspect of requirements or obligations, but it does seem that when we are making comparisons we need to attempt to make the right kinds of comparisons in order to get some sense of the right answers, and I would imagine that any kind of entity that is offering internet services (such as a forum) is going to seek some levels of counseling and advisors, in order to have some sense of parameters regarding how far that they might be able to go in terms of offering services or if they might be personally liable for the conduct of their members or any services that they offer.
I am not really opposed completely to the idea of theymos as a president of a company, but I think that the fact of the matter is that the forum is not a company, but it is completely owned my theymos. I am pretty sure that it was him and Cobra, and then they worked out a deal in which it is ONLY theymos... so in that sense, owner is different from president.
I am not sure if I should go on more, but a better analogy might be that if theymos is an principle, then if anyone receives any kind of benefit from him in terms of representing him or the forum, then things that they do could be attributable to the owner (the principle).. the forum members are different... I doubt that anyone really wants to attempt to flesh out these kinds of matters within public threads, and that is sometimes why there might be consultants who are involved in regards to perhaps understanding the extent that there might be boundaries that can be crossed or that should not be crossed.
Your hospital, bank or higher institution analogy is also kind of strange because the use of various services in the meat space will have differing obligations. For example, in a hospital, if a person goes to the hospital for treatment, and in the course of treatment, the medical staff learns that crimes might have been committed, they may or may not have obligations to report the crimes, and the extent to which they can refuse services is likely going to vary depending on if the services are life threatening or not or if the disease is communicable, they might need to report it... or they might have obligations in regards to whether they can share information about the medical treatments and conditions of their patients. The obligations of banks have changed through the years, and maybe we go back to some of the concerns of overreach in which some governments try to impose obligations, even if it might be questionable if they have jurisdiction over the activities. We could go all over the place with your attempts at analogies, and I feel that I already have said enough, even though I have my doubts about whether if anything I said was very helpful.