Few points to this. I can get into more detail if you're interested but I'd need to expand into a long form note (blog post) to get proper deep with it.
Firstly, buying stolen CC info is nothing new, and even in current statist capitalism, it is in the best interests of the banks to detect fraud as fast as possible and compensate the affected customer.
I've had card details stolen before. Got noticed quickly. Card got cancelled and replaced. I got fully refunded. The only party to lose out is the bank. Besides the fact banks are insured for exactly this type of scenario, why the fuck would I care if a bank takes an L? To me that's a victimless crime.
Second, most people on the darknet (which indeed is the epitome of agorism in the digital space) are there to buy drugs, not bank details. This is very clearly reflected in the number of listings for each category. Drugs dwarf fraud. Supply and demand clearly favours drugs.
Now whatever your personal opinion on drug use may be, I hold that it isn't relevant if you believe in individual freedom. If an adult makes a decision to consume a substance that can only harm themselves, they should be free to do so. Additionally, DNMs create a market with increased harm reduction due to feedback systems and knowledge being shared on safe dosing etc (ala Bluelight).
I'd even go so far as to argue this is safer than the pharmaceutical industry which has a long history (and present) of lying about the efficacy, addictiveness, and safety profile of its drugs and making people believe those lies by convincing doctors to repeat them.
Nostr is different from existing DNMs because it enables the potential for greater ease of use and wider accessibility. Most people cba to setup Tor Browser and PGP. But if they can just lookup a NIP-05 in a Nostr client? The barrier to entry has just decreased significantly.
