At least 870,000 bitcoins are associated with illegal activities. This is about $ 10 billion.
- Darknet marketplaces - 585,000 BTC.
- Stolen bitcoins - 204,000 BTC.
- Scam project organizers - 98,000 BTC.
- Other illegal activities 3,000 BTC.
https://markets.chainalysis.com/#risk-illicit-placementOne day, all these bitcoins will somehow hit the market.

W never knows and like what other have said maybe its already been
mixed with our so called clean coin
The fact that mixers are available and those who are working illegally
are also knowledgeable with every illegal
activities that they are working around, its not impossible that every
coins from that graphs are
already coexisting with the market especially around exchange, backdoor
trades with mixing services.