I think darkweb marketplaces are a slightly different use case though. The requirements for a darkweb transaction are the ability to tell the vendor your addres

I think darkweb marketplaces are a slightly different use case though. The requirements for a darkweb transaction are the ability to tell the vendor your address so they can send you illegal goods, while hiding it from the marketplace itself in case their servers are seized. A random PGP key with no real name and no verification is entirely adequate for this purpose - indeed, any kind of identity validation would probably be seen as a negative for such a situation.