I think people with a criminal mind ready to act on and undertake illegal activities don't care whether it is fiat or crypto as long as they can obtain them with minimal effort and get away with it.
That said, only crypto with less involved 'hacking' due to required expert knowledge would be at higher risk, while fiat would be at the top. We need to remember that for now crypto is still in its early days and it would take time until criminals would adopt crypto as their main strategy, like fiat is today, and there are plenty of articles written on exactly this.
Criminals will commit any crime they know and can escape the law. Why do many criminals choose fiat over crypto, because the majority of criminals
are not familiar with crypto. So they won't risk committing crimes against something they don't understand. It's the same with most people today,
there are still more people who invest in Gold than crypto. Like you said crypto is still new in this world, the majority of people are not familiar with it.
So it does take time for criminals to choose crypto over fiat. If in the future many countries have legalized crypto, then I am sure that criminals will
also slowly start to switch to choosing crypto over fiat.