Yes, the problem is that when the Ecuadorian (or any other) economy faces some serious problem, as it sooner or later will, the Central Bank/ digital mint will be able to distort the money supply, and the Economic Ministry will probably take measures to rescue the economy that are based on exerting control over the currency. These measures may or may not work for overcoming the short or mid terms problems of the economy. But the exchange value of the currency will certainly be affected, and possibly not in your favor. So you better trust those in charge, permanently. Or be on their side.

It reminds me of a recent announcement by the Argentinian Central Bank (I think they took it down but you can look for it http://www.bcra.gov.ar) where they warned citizens against Bitcoin, because its value is known to fluctuate, and could go down. The Argentinian Central Bank, which has presided over the wiping out the value of the peso at least three times in recent memory!