Probably because crypto is only useful insofar as it can be converted into useful fiat currencies, which means that it can be tracked.
If you're speaking in absolutes, you're not using your imagination!
I can think of tons of schemes to anonymously extract real world spending power from crypto coins..
Crypto, the not-so-fast bullion-based international payment system. Perhaps the perpetrators might have better luck sending each other USD notes by mail instead.