> Otherwise anything one could trade could count as money. But that's correct and often occurs on black markets for all kinds of reasons, for example coffee an

> Otherwise anything one could trade could count as money. But that's correct and often occurs on black markets for all kinds of reasons, for example coffee and cigarettes in Germany after WW2 and Hungarian salami and tires in the GDR. There are no alternative currencies because they are strictly prohibited by penal law, otherwise they would occur in all kinds of areas. Governments only allow highly regulated alternative currencies, and even then only under very rare circumstances. Crypto coins weren't an exception to this, they only emerged a bit faster than how legislation could be updated.