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The argument against is why would you leave your money exposed going forwards if you know a handful of countries can freeze it on a whim
I agree it is potentially a good thing to do in this case but putting forward the argument for why it hasn't been used before and it has the potential to have an extremely detrimental impact on everyday citizens
See the Afghan example
https://abcnews.go.com/US/wireStory/chief-warns-millions-afghans-verge-death-82247628
Sets a really shitty precedent and potentially leads to countries withdrawing their money for fear it is no longer safe in Central Banks. The US have basically done it recently with the Taliban, The Government of Afghanistan had 6bn in the Federal Reserve and when the Taliban took over, the US said they are keeping it, some of it is apparenty going to be used to as payments for families of 9/11 victims apparently and their is a famine in Afghanistan