Money laundering is the illegal process of concealing the origins of money obtained illegally by passing it through a complex sequence of banking transfers or commercial transactions. The overall scheme of this process returns the money to the launderer in an obscure and indirect way.
SourceIn it development, Money Laundering crimes have become increasingly complex, crossing jurisdictional boundaries, and using more varied modes, utilizing institutions outside the financial system, and have even penetrated into various sectors
Source, and in my opinion bitcoin and altcoin and cryptocurrency too.
From the above understanding, we can conclude that this action will clearly harm the country economically. Almost every country has committed this crime and we as citizens must support government efforts in terms of prevention, implementation, and compliance with rules.
In the case of the OP, I appreciate the efforts of the Polish government in preventing money laundering. I also hope that other countries can reveal similar cases so that this step is more effective.
Cryptocurrency is a medium that according to many people is very vulnerable to money laundering. But I do not expect cryptocurency to be blamed in this case, because it is not the wrong media but the perpetrators who have the right to be blamed for abusing this media.