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It is, but like @Johanalejo explained, the entire logic of the crypto market kind of renders this "stable" state of a coin useless when the average user uses it that way. You'd need a variety of "stable" coins, that wouldn't really increase like others.. I think...

It has been an useful tool this last month. I haven't used it because I rather just hold those coins I'm confident, but many people actually gained some BTC (ETH, LTC, etc) buying and selling USDT