How would you feel if your governement makes a no mixer law and backdates it so that you have to explain your involvement as an advertisement service for them? and user of their service as you just admitted to.
I doubt that this can be done in the USA. In the EU, I'm telling you, it can't be done. Retroactive effects can only be applied when they benefit the population, not the other way around, and I understand that this is a general principle of law.
The public authorities cannot take and prohibit writing in forums, and apply retroactive effects, putting us all in jail. For something to be a crime, there has to be a law criminalising it at the time it is committed.
So I doubt very much that a law can be passed whereby those who advertise or use CM on this forum will be punished retroactively.