I don't really get how this relates to my point? All I was saying is that buying on the "dark web" is not always synonymous with bad intentions. I did not say it legally (I assume that's what you meant) allowed parties to trade, although I will say that it does physically allow parties to trade, as "dark" markets have been thriving for years now.
I meant to illustrate that dealing in physical goods is well defined and regulated, any trouble will have no regards for intentions or what is physically possible.