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I don't understand, what's the pay period? One day? Doesn't it mean that they're paid at least the minimum wage per day?

Usually 2 weeks.

Thanks. Does this basically mean that waiters are entirely free for restaurants and cafes (as I doubt any fails to reach the minimum wage in tips)?

The $2.13 they mentioned is the minimum hourly rate the restaurant has to pay in that circumstance (federally, it varies by state)