This sort of ponzi scheme is mostly what's causing some people to have misconceptions about Bitcoin. I am glad you made the correction, OP. I appreciate that. When I first bought Bitcoin and showed my friend the bitcoin in my wallet, he somehow felt discouraged and asked me why I wasted my money on such a scam thing, but I had to explain to him that Bitcoin is not a scam, and he was like, "Where can I sell the bitcoin?" All those silly questions were because he felt there was nothing like Bitcoin and no market for it. I just feel it is always right for those of us who are at least informed about the reality of Bitcoin to correct people who have misconceptions about it whenever we encounter such people.
Well, OP have done a great work. Not everyone does it. Bitcoin at the beginning days were much used on gambling and for illegal transactions. This itself a negative discussion on bitcoin. Later the same bitcoin have grown good and had been used for investment, transaction, trading needs. People should understand the difference between the ponzi schemes and real potential of bitcoin compared to other cryptocurrencies available for usage.
The greatest advantage in using Bitcoin for illegal transactions is, to show that somebody else said that it was illegal, not you.
If you have an agreement with government or somebody else that a certain kind of transaction is illegal, then it is for you, because you agreed to it.
In the USA, the 9th Amendment (in the Bill of rights) says, "The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people." This means that we are not simply limited to the rights that are listed in the Constitution. See
https://www.law.cornell.edu/constitution/ninth_amendment and
https://www.law.cornell.edu/constitution-conan/amendment-9/ninth-amendment-current-doctrine.
File a statement with government that a particular right you are using is a right for you, even though they say it is illegal. Base your use of it on the fact that the 9th Amendment is their restriction, to keep them from messing with you for doing what is legal in your eyes.
The only things that you must do are, don't harm anybody, or damage his property, or threaten him, even accidentally. If it is something illegal in a big way, figure out ahead of time how to successfully stand against them in court.