According to Chainalysis, almost one million Bitcoin (BTC) is held by illicit actors in the space with over half being held by darknet markets.
Illicit markets currently have 585,000 BTC in their possession, scams have 99,000 BTC, stolen funds constitute another 205,000 BTC, and all others hold an additional 3,000 BTC — a grand total of 892,000 BTC. According to Chainalysis, only 0.32% of all current Bitcoin flows are tainted by illicit activity.