Lol because we expect companies to pay people properly rather than expecting customers to top it up.
Tipping is immoral as it allows companies to underpay. Tipping is anti free market as companies should be competing for staff through their remuneration packages.
The thing I've never understood about tipping culture in general and especially the American culture around it is why some low paid staff get it and some don't.
Why do you tip your food delivery driver and not the guy delivering your Amazon package?
Why do you tip your wait staff, but not your supermarket checkout assistant?