If the use of it is banned in just a few major economies (ie banned in the sense of blocking contact points with the regular economy in the conversion to tradit

If the use of it is banned in just a few major economies (ie banned in the sense of blocking contact points with the regular economy in the conversion to traditional currency or purchase /sale of goods or services) then the value of BTC would tank, no? BTC doesn’t need to overcome its energy needs, so long as people just stop wasting any energy. There is an infinity of things with massive wasteful energy use that no one does (such as sending rocks into space or boiling lakes for fun) simply because there is no financial gain.