As far as I know Bitcoin started evolving after the huge success of Silk Road (
https://en.wikipedia.org/wiki/Silk_Road_(marketplace)).
Be extremely careful if you set a black market. The first clients can be secret service agents. They can come with hundreds of
BTC and become your friends. Few month later you can be in a prison

.
You will only be in prison if you are doing something illegal, which is why most people explore the dark web anyway. I wonder who invented it in the first place

No one know who create darkweb and even those people there also we dont know so its hard to trace them to that place which that place is the best for doing illegal activities because when youre there youre invincible and that dark web so be careful if you try to surf deep there.