People use it to get around payment processors, and don't pay taxes on the gains back into dollars. You dont make anything if You don't exit into dollars.

It has helped people who've been banned from paypal, visa, mastercard, and dont have a bank account, so there's that.

I do agree that the potential for trouble from the Feds' ability to make allegations of tax evasion, financing terrorism, drug trafficking or human trafficking is concerning.