One study a few years earlier by a researcher at the University of Portsmouth in England had found that while dark web drug markets represented the largest single category of dark web sites—about 24 percent of them—dark web traffic was dominated by visits to a far smaller number of child abuse outlets. Those CSAM sites accounted for around 2 percent of the dark web’s Tor-protected sites, yet patronage of those sites accounted for as much as 83 percent of the dark web’s visits.[*]
