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That's my whole point - what you describe, was the original vision behind Bitcoin.
Life turned otherwise - instead of being a *currency* Bitcoin turned into a speculative commodity that was dominated by The Silk Road and ransomware gangs, simply because they can accept high transaction costs and volatility.
All that is mostly coal-powered, and concentrated in a few pools in one country.
So it's neither decentralised, nor currency, and has very high external costs.