What are the latest dark net markets these days anyway and have they gone Monero native yet? 2-of-3 multisig will at least provide software level trust of the escrow process. The reviews on quality of goods would still be important though, but from an enforcement side it will be exponentially more expensive to take down one of these sites. Prior DNM busts typically also got the warchest of everything held in escrow,…
I checked a few sites I found from the list in the sidebar of /r/darknetmarkets. A couple of them allowed paying into their escrow service with Monero, and for vendors to receive Monero, but it looks like they're still fundamentally based on a multisig Bitcoin transaction. This seems like a mistake to me; I would have expected faster Monero adoption, especially with Bitcoin hitting performance bottlenecks.
I'm not sure Monero's 2-of-3 multisig is actually merged into production yet, but they have 2-of-2 so thats still a real limitation. Also Monero has and will hit performance bottlenecks very quickly too, cryptonote coins have no layer-2 scaling solution on the roadmap. Although they have had adaptive block sizes from day 1, the block sizes grow very slowly compared to spikes in traffic. The transaction fees would quickly reach unoptimal $ amounts, but the market itself would just require larger deal flow.