This silly thing must only happen in usa, because the employee's paycheck is not the customer's responsibility but the employer...

In most places in EU, a decent and fair paycheck is given to the waiters so they don't rely on people, and that portion of their salary is included in the bill BY DEFAULT, EVERYWHERE.

Otherwise you start getting into this stupid tip, no tip, tip included but tip again on the subtotal, 5% tip, 8% tip, 20% tip, "oh jerry you only pay 2$ for tip? broke ass, I pay 4$" "shit food but waiter's gotta eat, tip", "waiter only smiles for you to pay a tip", pay 20$ for food and service and pay extra 4$ for service but it is a tip "because waiters wage is only 4$/h" but then you check and their average salary is like a normal salary, but then this place pays badly to their waiters, "but no! you must tip fairly!, just do the π*2 rounded by this macPlumbus indoor kart divided by the current price of a gallon of petrol real quick, times 2, and then round up", and on and on. Classic USA bs for sure.