I had always linked them to the idea of assassination markets, an idea which I can't recall where I read of it. Which is just evil and a way to 'do' plausible deniable assassinations. en.wikipedia.org/wiki/Assassi...
(Do between quotation marks because from what I heard asking for assassinations on the dark web is a very good way to get in touch with scammers, police, or very competent scammers who also fake the death of the target to get the payout).
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(The story (by the police) goes that the now pardoned (thanks Trump) dread pirate Roberts tried to use darkweb assassinations for hire to get several people killed, none of them worked).