The interstate commerce clause does not allow for the regulation of private business, as if it did, it would contradict the requirement for government to not interfere with private contract. The courts have routinely blown this one in the past hundred years. It is about disputes between the states.

The coinage clause is about using money for government debts and payments, not for regulating private usage.

But I suppose they also don't have the power to regulate arms and impose background checks, yet here we are.....