The cat is out of the bag. Without public policy declaring no more tipping, any business that moves away from it to higher sticker prices will be immediately punished by the market.

What Grubhub is doing here is a calculated, likely-temporary cash grab that they know for a fact will come at the expense of the drivers. By the time enough outrage builds that they have to change the UX again, they’ll be that much closer to balancing their own books.