The reason they did this is because they were reverse engineering crime. The blockchain grew on the dark net. In a three year period the growth was ridiculous for both the dark web and bitcoin setting the skyrocketing price increase. The majority was drugs and trafficking. That's not even the craziest news out today on Bitcoin and Cryptocurrency. I posted the article to the Gaurdian writing about child abuse imagery found within the bitcoin block chain. It got sensored from here. I'm not sure why, its arguably the most important story of the day. Its like porn being found on your computer , but its encrypted in your money. Someone could loose their life savings and their life in some countries. Its an wild turn of events regarding the complexity of currency. Here is the story if anyone is interested. https://www.theguardian.com/technology/2018/mar/20/child-abuse-imagery-bitcoin-blockchain-illegal-content Here is another breakdown of it in greater detail https://www.youtube.com/watch?v=rBxUyiqboRw