I think you misunderstood. In some states, you will be paid below minimum wage if you make enough in tips. IIRC there was a story a number of years ago about servers in Tennessee (?) only making $2.15/hr. It was legal because they made enough in tips to cover the other $5.10/hr that the restaurant is supposed to pay. So instead of the tips being extra cash on top of pay, the restaurants were literally having the customers subsidize the majority of their pay.