Cryptocurrency threatens to erode the ability to trace and stop transactions linked to crime, terrorism, and corruption. A key feature is that cryptocurrency can often be traded with no centralised body tracking them, making them a viable conduit for money laundering, which is a cause for concern for regulators globally.

https://www.smh.com.au/world/asia/from-money-laundering-to-sanctions-busting-the-real-value-of-cryptocurrency-may-soon-be-clear-20190808-p52f1l.html