Good thread OP, for educational purposes. Hahaha. This topic should be stickied somewhere in my opinion.
"Criminals always adapt to new technologies faster than others. Not only because of their inherent adventurism, but also because of the need to be one step ahead of law enforcement. Therefore, it is not surprising that the first real example of the use of Bitcoin was the calculation of illicit markets on the deep Internet. Thus, it is thanks to Silk Road that the Bitcoin was discovered outside the community of cypherpunks, including law enforcement agencies. However, it became a double-edged stick: along with the first rise in price and popularity, Bitcoin has established a reputation for currency for drug traffickers. Bitcoin on Silk Road has taken Darknet economics to a new level, but over the past few years, marketplaces on the deep web have been disappearing one after another.
OR, the technology available is also making it possible for the inefficient to be more efficient, creating new markets. Simply an evolution of "a market" perhaps?
If you want to expand your thread to Bitcoin mixers, you can get one Bestmixer.io. The shutdown of Bestmixer.io gave a reason for BitBlender.io -- that used to be a big and trusted mixer, to make a scam exit. They blamed on the risk of shutdown from Europol and run away with customers' fund.
Or the mysterious closure of BitMixer.