Bitcoin isn't only a currency, tho. It's also a store of value and a measure of cost/energy. It's true money. And something being useful or beautiful is a lot of value. We can use useful things to do good works and beauty inspires hope and motivates laborers. If you can use this modified rock, we call Bitcoin, to feed the poor and heal the sick more efficiently, than with unmodified rocks or letters of credit, then that seems morally significant.