Monero has darknet dominance (ransomware and dnms, soon p2p markets because it's forced to do)... it's the market that's the ultimate judge and no one can track it, only if the users act stupid. I think that's the point of the conversation, how permissionless markets do transactions and not the price of the asset.
The samurai tools is not just ricochet, and I think it depends on whether you make a communication channel with the samurai paynym. That's a good question for LaurenMt.
The xpubkey leak was only on samurai wallet connecting to the samurai node, or how do you connect the addresses if you don't use your own node? Bloom filters are useless in a low bandwidth environment (aka tor network)
LaurenMt, the brain behind the Samurai tools and DojoCoder, spells out the usual fud on Samurai. I trust more on people who are in danger of jail, that people who comply or bash the dark net markets tools.
The tx graph on btc it's really bad, the good thing is that swaps between different networks of btc is pretty easy and spending on lighting is really private