Brains can’t mine digital money. While computers can mine cryptographic currency, human beings cannot do so efficiently with their brain, putting them as second class citizens to computers. Moreover, most people don't have an option to issue money by doing valuable work, and not selling it. However, it’s an aspiration of so many artists and scientists, mathematicians to actually create a work of art, for the sheer aesthetic beauty or utility of it for everyone, and donate it to the world, rather than to sell it. We need a way for brains to issue money, but we don’t have it yet.
The goal would be to enable human brains to do that.