> I mean, imagine the scenario where the server just buys a line cook a drink to say thank you. Fraud!
That would be a case of the server getting the money and deciding to buy something for the cook.
Whereas in an actual tip-sharing restaurant, the server gets his share of the tip pool after the cook's share has already been taken out. He doesn't get a choice in the matter.
This is generally not what the people giving the tips have in mind.