Why would a country invest in expensive & power-hungry infrastructure in order to produce a currency that it can't create or destroy at-will? In the unlikely e

Why would a country invest in expensive & power-hungry infrastructure in order to produce a currency that it can't create or destroy at-will? In the unlikely event that any sovereign nation did adopt a cryptocurrency, it would be far more likely to produce its own that it could manage more directly and which would provide all the benefits of BTC that a nation-state would be interested in (infinite traceability, impossible to use anonymously, remote destruction, etc).