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?
Asking a lawyer is probably a better idea, but I'm just curious if someone else had had the same concern before.
You didn't sign any contracts so you will not get associated on what might happen to the company do in future. For sure you will not in the list of their employee so if you are worried about anything like the scamming that might happen to the platform you advertise or to any other then you are not included to number of people who will do or seek a solution on their problem.