CBCD is been created by government of a country to minimize fiat currency which is depreciating gradually. It does not have any effect on the global economy and it is not also a decentralized currency. No matter the way it is presented to the citizens it still remains centralized. So if a country creates its own digital currency and link it to gold or oil barrel price it still will not change anything.
Cryptocurrencies are much helpful for developing countries since they can increase their economic and social status.It all started with bitcoin,and now so many other cryptocurrencies has been added or existing.This new innovation of cryptocurrencies has renewed the economic standard of countries that uses bitcoin.Just like El Salvador,that country doesn't seem to have a problem adopting or making bitcoin a legal tender.
The Cryptocurrency network is backed by distributed ledger technology,called the blockchain network.It eliminates the risk of fraud and corruption,because of the decentralized financial system as no individual can manipulate it.The crypto-based network is moving towards Progress despite the predictions and critics.
Cryptocurrency is a new and speculative technology so embrace it,upgrade yourself,buy cryptocurrencies, study them, invest in them, trade them.This is 21st century,and technologies like bitcoin has done more good than harm to us.