Got a citation for that? Lots of waiters in the US make $2/hour or something before tips (can anyone correct me here?) where the expectation is that tips will bring them up to $7-8/hour, more in line with other minimum wage jobs.
Back in 2008 my sister would easily make $200 a night working at Red Lobster in a town of 80,000. That was just the tips, not wages. Prices have probably doubled now, along with the tips.
Very few waiters are making as little as you say. Just think of what you pay as a tip for one table for 2-4 people and remember they’re handling quite a few tables at a time. Quite often if they get a bachelors degree and the attached salaried job they take a significant pay cut, but the hours are better for having a family.
In California (the most populous state), there is no “tipped minimum wage”. Everyone earns at least $20/hr. In fact, about 1/3 of states don’t allow employers to pay less for tipped employees.