Underpaying is the law. If restaurants were required to pay minimum, your dinner would be at least $30. I hear you, but it’s again, it’s more government intrusion.
Thing that gets me is some well to do restaurant like The Metropolitan in Seattle ... dinner for two is like $150 plus. You tip $20. My peeve is the owner(s) don’t have to pay their waitstaff much because they feel the customers will make up their salaries. I remember once when I was in Tokyo, went to a great eatery, and without thinking left a tip. The waiter chased me down the street to return the money I left.