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For payment system, stable coin is really better since it's not volatile, no everyone who transact online can take the risk of volatility so we are seeing this happens. Actually I am happy with this kind of development because these stable coins are still just part of the crypto market, when they get popular and grow, the effect would result on the entire market.
Moreover, cryptocurrency is more effective if it is used as a commodity of trade and investment, rather than just being used to make payment transactions. Stable coins function the same as e-money, only that e-money is adopted more and more legally because it is based on official fiat currencies.
In my humble estimation stablecoins are so useful for everyone, that is why if there is some crisis like Corona, stable coins can save your money from the crisis. l mean if you realize that there is some problem, you can convert your money to stable coins and just can relax.
It will save you thousands of dollars. But it doesn't mean stablecoins will be the future of cryptocurrency.
It is indeed effective as a strategy to secure assets in an extreme market. But you should not save it for the long term, the risks are high, especially regarding the freezing of funds:
https://github.com/OmniLayer/omnicore/releases/tag/v0.3.0#freezing-tokens-for-managed-properties