These so-called digital currencies are the ultimate way to launder money since they are still annonymous, outside the scope of most laws in many if not all jurisdictions and without any intrinsic real value than the perceived value of the services for which they could be converted. The loophole will be closed and afterward, the reverse will happen, in the name of transparency there wont be any privacy left. FATF will issue charming recommendations adn they will have the same fate as bearer shares...

there is no reason for a different currency, just different ways to transfer money one way is via cash. it goes from one hand to another in moments and can done any place any time - no need even for a power source to run equipment.