On the community I have no idea, but I imagine the next reincarnation of these type of markets will have to be managed by lone wolfs out of a cave in Afghanistan.
Space law tends to be extrapolated from maritime law as many of the legal condundrums are similar. So if you had a pirate satellite then it could probably be seized under a letter of marque. It's a fun question, I'll look into it.
If you don't live in Iran, staring down the Iranian justice system [given the lack of love other nations have for them] is pretty easy.
Tbh tho, I wouldn't be surprised if you setup an Iranian site that you weren't accused of "funding terrorist operations" and the trial gets replaced with a US drone strike.
To my knowledge, there have not been any drone missile strikes in Iran. That would likely constitute an act of war. Iran did shoot down a spy drone back in 2011.
The US would never extradite to Iran, so unless you are
so desperate to open a "dark net market" that you move
to Iran, you will stare down the US justice system, not
the Iranian tribunals.