the purpose of this site being the share of knowledge here is some food for thoughts: two books in pdf (well supposing that you don’t already know them) that you can download from a quite discreet but very efficient site named Bromium.
Both of the books focus on the cybercrime economy and its growth and expansion. According to their analysis in 2018 “cybercrime economy generates a whopping $1.5 trillion in revenue each year – a number that will very likely continue to increase”. One is focused on “regular” cybercrime named: Into the Web of Profit. The second one is centered on the darknet criminality.
Book One: Into the Web of Profit.
Book Two: Darknet Criminality