If these were hard currencies backed by something real, then I could see the point in trading them. The problem is that every currency in the world is either worth only the paper it's printed on, or else only represents the issuing government's power to tax. In neither case do they have any inherent value of their own.
Even more to the point, when currency is created, it is "borrowed" into existence. This is done either by printing bank notes or simply entering the amount in an electronic ledger. The newly created currency must be repaid with interest. But, the currency needed to repay the interest is
never created. The endlessly increasing debt becomes a vicious circle.
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