There was recently a controversy over how Doordash implemented its tipping policy. Drivers get paid a wage to deliver food to you, and you would expect that if you specify a tip through the application, that tip goes to the driver and their compensation is increased by N, where N is the amount of the tip you specified.

It turned out that until recently, that was not the case; drivers would get a wage to deliver food to you, and if you specified a tip through the application, then the driver would have money deducted from their wage equal to the amount of the tip up until tips made up one hundred percent of their wages, at which point tips would increase their take-home.

So in effect, Doordash was using tips to subsidize worker pay as opposed to augmenting worker pay, and this was in no way communicated to customers who reasonably expected that a tip would increase the worker's compensation.