Many countries are actually terrifying about this, because corruptors will be able to erase their tracks when corrupt money is converted into bitcoin. and many things that harm the country can happen and can be done in this way. But the state can protect with strict regulations to anyone who wants to buy and sell, it must go through institutions that have been approved by the government such as banks only. where everyone who wants to join a legal institution of the government must have a local bank and if a large transaction must be KYC first.
 
now it remains the institution that is not allowed to commit violations, otherwise it will still happen even though there may be protection beforehand.