A built-in "service charge" is a scam: it just lets the restaurant advertise lower prices than what the meal truly costs. Same goes for not showing the after-tax prices. If they really wanted to "keep compensation as fair as possible to everyone", they'd simply pay them a proper hourly wage, and adjust their prices to suit, instead of making their pay dependent on that day's sales.

A lot of US business practices are all about scamming people with deception, and restaurants are the epitome of this.