My point is rather that an online marketplace in the absence of decriminalization and reform can only provide a marginal increase in safety. Sex workers marketing on Backpage, Craigslist, Onlyfans, and IG still face a great deal of risk of violence, pressure from pimps, and prosecution by law enforcement. It's a deeply complex systematic issue which can't be fixed by a website.
For drugs in particular, darknet marketplaces primarily rely on unspeakably violent criminal enterprises upstream. The consumers, sellers, and communities implicated in this supply chain are all losers in this system. The cartels are the winners and the global "war on drugs" establishment are a close second place.