It depends on the crime. If I bought drugs on a darknet exchange how would the researcher know to include that in the 0.15%? They don't. Not unless, e.g. that

It depends on the crime. If I bought drugs on a darknet exchange how would the researcher know to include that in the 0.15%? They don't. Not unless, e.g. that exchange gets busted and leaks all of its data. This title should really be "easily identified illicit transactions constitute 0.15% of trading volume". Which I'd say counts as a lot.