If someone thinks crypto ban will reduce the amount of laundering and darknet traffic, he's silly. Crypto is just a tool, all the crimes are made by people, if crypto won't work, they'll switch to something else.
That's merely an excuse to ban anything. Almost every advanced technology has been used in criminal activity. Advanced technology is being used by criminals right now. No one trying to ban them, because not only bad people use technology, but everyone else, common people. If every new invention used by criminals had experienced ban or other serious impediments, we would live in cold caves today. We wouldn't have evolved as society at all. Banning anything that may be useful for humanity leads to degradation of society.