It actually already does cover it. He's tricking folks into tipping twice by failing to disclose that they have already tipped. It's simple fraud.

Bullshit. Hopefully it’s one server and management should take care of it. But it’s appropriate to complain to the right authority so they can see if it’s a pattern in need of enforcement.

This is how things get done. A single instance of food poisoning can be a mistake, but a pattern of food poisoning is potentially in need of enforcement and remediation. But they can’t see a pattern if no one complains