It’s a difference of opinion between the authors. If Bob transfers $10 back and forth between both of his bank accounts 99 times and then buys $10 worth of cra

It’s a difference of opinion between the authors. If Bob transfers $10 back and forth between both of his bank accounts 99 times and then buys $10 worth of crack, would you say that 1% of Bobs money was used for illegal purposes or 100% of it was used for illegal purposes? Depends on what specifically you're trying to measure. There are two things here that are simultaneously true: 1. A small percent of BTC transactions are for illicit purposes. 2. A large percentage of the goods and services purchased with BTC are illicit.