You imply they migrated to use crypto and stopped using traditional banking. No evidence that it is the case. Some criminals may have easier access to crypto f

You imply they migrated to use crypto and stopped using traditional banking. No evidence that it is the case. Some criminals may have easier access to crypto facilities than banks hence activity, or cost is lower that way for the initiated, yes. It doesn't mean volumes of teinted activities is anywhere as big via crypto than it is via fiat. Common sense could take a guess, but there can't be much certainty as illegal activities happen aren't made in plain sight in either route.