In the United States of America the policy for cryptocurrencies is pretty strict. There happens to be several governmental organizations that exist to uphold the law within the financial sector. When dealing with assets like cryptocurrency, the sector falls into one of many areas of law. The CFTC or (The Commodities Futures Trading Commission) is there to regulate commodities, & Futures.
Then there is the SEC (The Securities Exchange Commission), which regulates securities laws.
Last but definitely not least is the IRS ( Imternal Revenue Service), they regulate tax. So as you can see, there are many regulatory bodies in existence.
There are many regulatory bodies over looking the market and we had some high profile arrests in the dark web too when the criminals were foolish enough to use bitcoin to do illegal trade thinking they are safe and when you are foolish enough to do such activities you are bound to get caught and the authorities have confiscated and auctioned bitcoin in the past.