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I think the upvotes are more in the spirit of "I share your frustration and negative outlook of crypto in general" rather than an endorsement of the specific policy suggestion.

While I agree that making something illegal won't stop it from happening - in this case, banning a currency drastically curtails the functionality of it. That reduces the value of it, which in turn would reduce demand and supply.

"Making something illegal won't stop it from happening"

But in the case of cryptocurrency, putting impediments in the way of exchanging it back and forwards with 'fiat' would significantly impact its appeal and demand. Could they stop it entirely? Probably not. Would it stop most people who only care about the easy profit potential and don't care about the idealogy? Probably.