Crypto has no technological merit compared to earlier solutions, except "permissonlessness", which enables the circumvention of rules and regulations (at huge expense). But, sure, enabling crime is "doing something".
It solves a CS problem called the Byzantine Generals problem. That problem was thought to have no solution before blockchains were created. The lack of CS knowledge on this board is pretty staggering sometimes.
Enabling crime is massive. You have to remember that "crime" includes things like "selling abortion pills", "selling LSD", "selling ivermectin" and of course "supporting Palestine Action"