At least 870,000 bitcoins are associated with illegal activities. This is about $ 10 billion.
- Darknet marketplaces - 585,000 BTC.
Assuming that all these bitcoin are spent for drugs (that is absolutely not true since there other illegal/grey-hat stuff sold in black market)
Let's make some count, and compare it with FIAT money....
585000 * 11400 USD = 6,669,000,000 (at actual value, obviously this in historical chart, it means they are counting ALL bitcoin involved in this activity) 6 billions of equivalent in USD
https://www.worldometers.info/drugs/238,399,050,000 = 238 billions of USD
I think it's enough... there is not much to say...