I don't see it's impossible, on Fed Chain, but it won't happy based on the past research and dilemmas. There's no any upside though for Fed to run a vast technical infrastructure(cost reason) with no community-back.
Taro is opening a door to welcome any central banks, literally, now it's their call to adapt it or not.
A central bank using an existing blockchain is in principle possible. If I recall correctly, Ukraine plans to issue its CBDC on Stellar.
But the only reason Bitcoin infrastructure is vast is to mess with the government. If you're the government, you might get away with just 10 nodes and no mining whatsoever. That's roughly what Stellar has, I think.
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