Dark marketplaces are these days really known for their scammers, I do not think its good for the bitcoin and we should not give it hope or boost their reputations..
These marketplaces are bad for the bitcoin because it gave the bitcoin a bad name.
I agree about this, there is sold a lot at these marketplaces but 80% percent is a scammer and the other 20% percent are cops so I do not think its good to be on such marketplaces.
I even think that we should not indeed come on these websites!
You have a point,after coming of blockchain and bitcoin ,these illegal trading has greatly rised because of blockchain decentralized nature.but due to these illegal trading the price of bitcoin is greatly affected.