Yes thats true. Cryptocurrency can be used for money laundering. In fact four primary areas of criminal activity lend themselves to cryptocurrency: tax evasion, money laundering, contraband transactions, and extortion. This is the reason why many countries are against cryptocurrencies. But I think thats the fault of people and not Bitcoin that they are using this wonderful technology for such illegal motives
When there are something new, people will get curious with it while other criminals,. There really are a lot of problems that occur every time that there are new things because people will always do improvements for themselves even thieves will also follow with the trends to understand more.