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I don't think so that 1 dollar is always 1 dollar but there are times that the dollar can decrease or increase by a tiny percent. Also the stablecoins that we are talking about here are only legit stable coins and not those scammed ones like ust and other algorithmic based stable coins. They aren't really stable because they can easily depeg.
One dollar bill is one dollar bill, there is no way a cashier will ask you for 102 bills to pay a 100$ product.
As for the "real" and "scam" tokens, how do you know others are legit?
Have you seen their cash, have you seen their bank account statements? Tether hasn't been able to come with proofs in years, why believe them?
If not comparing CBDC to bitcoin or other cryptocurrencies, CBDC is much better than current stablecoins. CBDCs are simply fiat in digital form and they are managed and backed by 100% government so it is still safe when compared to stablecoins issued and managed by individual companies. Once CBDC is widely released and adopted on exchanges then that is the end of stable coin.
CBDC is like the numbers in your bank account, it's one dollar for one dollar, stablecoins are like casino chips, they are worth 50$ but only id the casino wants to exchange them for you, with no guarantee it will do so, no guarantee it will still be there tomorrow and without anyone else accepting them.
CBDC is just the digital form with fiat, with no real advantages no real disadvantages over your card, for example, stablecoins are just the worst of the worse of cryptocurrencies, they can lose value overnight, they can be frozen, they can become unchangeable as exchange delist them and there is absolutely nobody you can complain to.