Like what you have mentioned, a learning curve in in cryptocurrency is required when you start using the said currency. Compared to fiat which has been the conventional payment that existed since time immemorial, the convenience and accessibility is already preset unlike in cryptocurrency. Although transactions are completely anonymous in the latter, one must still have to learn the fundamentals before they start transacting.
I also agree with this statement. When a criminal has already decided to commit a crime, regardless of the nature of payment it uses, as long as it achieves its goal then it would exercise all the means just to make it happen.