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people will prefer the CBDC i think because its easy for commercial payment services. if CBDC are to exist on blockchain i think Swiss Franc will work like stablecoin and every country will have their own stablecoin as soon as they launch theirs. i can only assume they will be using Ether network.
Come on, what kind of nonsense are you talking about, surely the digital currencies of central banks will not rely on a private project in which the speed of their transactions will depend on how much someone paid fee at a given time. Every country that will have a CBDC will also have its own private blockchain because that's the only way it can have control over its currency.