Not that I have experience in the matter, but I have heard that spending bolivar in Venezuela means waiting in long lines for goods with artificial prices, whereas you can buy whatever you want in USD.
I suspect that the bolivar/BTC trade is just a feel-good story, and the reality is that Bitcoin is not available to ordinary Venezuelans.
> I would be happy if Zcash and Bitcoin could serve as a gateway from an unstable currency (Venezuelan Bolivar) to a stable currency (EURO/USD)
How would this actually happen? Who is on the other side of this transaction? Who would want to cash out their Bitcoin in Venezuelan bolivar?
I assume the Bitcoin trades that actually occur in Venezuela are for USD and black-market goods, not for bolivar.