By definition black markets are not permissioned. If I told you "Hey here's a thing just like bitcoin but private" what's your first question?

-How is it just like Bitcoin but private? Does it have a supply cap? Does it have a similar network size? Market capitalization? Auditability?

Since the answer to all of those questions is No, then you would say, That was a lie right?

Monero's marketing is based on a lie. It is just a token that has some neat tricks to obscure sender, recipient, and amount. It does not have all of the properties necessary to be a good money technology. Namely scarcity. Even with scarcity, the network (and anonymity set) is too small for more market capitalization.

So, the overall point is Black markets are good because of the freedom and anonymity. The answer is not to then use the currency popular to the biggest black market (which by the way would be Ramen noodle packets because prisons have the largest black markets and that's what they use). The answer is to make markets more free and anonymous by making authority obsolete in a market, which is what bitcoin does. Anonymity comes when people use it as it is an opt in feature since the beginning of trade. (Knowing you trade partner and all that)