Regular people may not be able to "print money", but their governments do it on a regular basis.

This is why inflationary currencies always fail. They are based on debt, and a debt system will always implode eventually. The tendency is to avoid paying down the principle and keep on rolling debt over to longer maturities (in the bond sense).

This creates a big overhang on the production capacity of a system until all revenue is being used to service the debt load. Then it implodes.