It had always baffled me that our "tipping culture" isn't spelled out anywhere. How would someone know that it's your job to pay the servers because the restaurant doesn't pay them? I've lived in the US my whole life and I still don't know for sure who relies on tips and who doesn't. I mean, all waiters at sit-down restaurants do, right? But now every fast food place asks for tips at checkout. Uber, Lyft, Doordash, etc ask. No one has ever told me if they rely on tips like restaurant servers or not. What about hotel shuttle bus drivers? Hotel maids? The person cutting your hair at Great Clips? Your massage therapist? Your esthetician? Tour guides? I do not know. Is it written down somewhere? Should I ask?