Is that something we want though? Why would it be beneficial to let money be used for anything without restrictions? Society has always relied on interdependence, not complete individual freedom. You have to make the case for it.
Respectfully, I disagree that anyone has to make the case for it. That's exactly what freedom is: if society fails to "make the case" for prohibiting something, it defaults to legal. There's no general law requiring people to be good people, or to have common sense, which would be the same as defaulting to illegal. I presume you wouldn't like that, or the surveillance state that would be required to enforce it.
Respectfully, I disagree that anyone has to make the case for it. That's exactly what freedom is: if society fails to "make the case" for prohibiting something, it defaults to legal. There's no general law requiring people to be good people, or to have common sense, which would be the same as defaulting to illegal. I presume you wouldn't like that, or the surveillance state that would be required to enforce it.