The interesting point is why tipping as wage evolved only (or almost only) in the USA and in the rest of the world is a way to say thank you the few times that

The interesting point is why tipping as wage evolved only (or almost only) in the USA and in the rest of the world is a way to say thank you the few times that service is worth a thank you. It's not that businesses all over the world don't compete on price with nearby businesses or that their wages are so high that their staff would leave the tip on the table.