Never thought about it that way. Just wondering what is the percentage of crypto used for criminal activities? I guess it won't be easy to thing to measure?
Most of criminals prefer real estate and cash over cryptocurrencies. London and Dubai are the best.
Here is a documentary on Londongrad
https://youtu.be/GAOJCcwxDug?si=M0Lnso1rjmdckoDH
You can even find a map that shows different parts of London where East European and related criminals have set up their homes