How is that different from servers in a restaurant? If you asked that question of people who give a tip to their servers at a restaurant they would also say that that money goes to their server, despite the fact that the federally mandated earnings guarantee (assuming the restaurant doesn't have its own higher one) means that that money, effectively, might just be going to the restaurant.
> it's ordering food for delivery to your house and then giving cash to the driver
And would you be upset if Domino's gave an earnings guarantee to their drivers?