I don't know if you've actually tried to send an international wire transfer, but it requires more paperwork/effort, is more expensive, and is less reliable than signing a crypto transaction.

Many smaller banks require you to physically drive to the branch and wait in line to send one. They usually cost upwards of $40 and that's before currency conversion, which is done at a rate that may or may not be favorable.

Making a blockchain payment has pros and cons, but it has enough pros that the "only useful for criminals" argument is tired.