It is a federal law. If you worked somewhere that it didn't happen then they were breaking the law. It has been that way for years and year.Where did you possibly get the idea that management pays waiters to make up for them not making minimum wage? Please provide a specific example. As a person who worked in the restaurant industry for over 10 years, I never saw that happen once.
From the government website:
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What is the minimum wage for workers who receive tips?
The Fair Labor Standards Act (FLSA) requires payment of at least the Federal minimum wage to covered, nonexempt employees. An employer of a tipped employee is only required to pay $2.13 an hour in direct wages if that amount plus the tips received equals at least the Federal minimum wage, the employee retains all tips and the employee customarily and regularly receives more than $30 a month in tips. If an employee's tips combined with the employer's direct wages of at least $2.13 an hour do not equal the Federal minimum hourly wage, the employer must make up the difference.
Some states have minimum wage laws specific to tipped employees. When an employee is subject to both the Federal and state wage laws, the employee is entitled to the provisions which provides the greater benefits.
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It is one of those things that more people should be aware of but for whatever reason most people don't understand it and continue to tip assuming that its the only way the waiter will be paid... not getting minimum wage is a myth, probably perpetuated by the word of mouth from bad waiters that want to guilt people into enabling their bad customer service.