There are only about 800 criminal internet forums worldwide, according to the FBI. Not all of these dark web sites are run by criminals, not all of them are of interest to InfoSec professionals. The dark web is still reasonably manageable in size, but it still has a lot of interest in security researchers. A company can set up a dark web data mining operation and become productive in about a day, said Jason Polancich, founder and chief architect of SurfWatch Labs, Inc. “Most large enterprises are either starting this or already have it in place””]
Source: https://www.csoonline.com/article/3205924/is-your-data-being-sold-on-the-dark-web.html