Well the whole "tipping" mindset leads to that. It's supposed to be something extra, beyond what's required. Now they've started using it instead of having realistic prices and wages and developed social standards where tipping less than x% is supposed to be the signal (x ever increasing). The idea has gotten so ingrained that people tip on "tip-included" prices too. Soon it'll all be a "donation" with a "service charge", de facto mandatory "tip", and extra tips on top.