It is worth noting that, while the minimum wage is lower for tipped employees, their total pay still has to be above the ordinary (non-tipped) minimum wage.
To quote https://www.dol.gov/general/topic/wages/wagestips
> An employer of a tipped employee is only required to pay $2.13 per hour in direct wages if that amount combined with the tips received at least equals the federal minimum wage. If the employee's tips combined with the employer's direct wages of at least $2.13 per hour do not equal the federal minimum hourly wage, the employer must make up the difference.