And the restaurant can say “no.”

And now you have hordes of angry customers who can't understand why you have a Doordash listing (that you didn't create and don't want) but won't fulfill orders.

  If I were a restaurateur and caught a glimpse of a Doordash driver in my
  finest establishment, the first thing I would do is put together a simple
  online order form and start advertising it in every order. 

Whether it's not wanting to give Doordash a cut, not wanting to sell food that doesn't travel well for delivery, not wanting to crowd out local customers, not wanting Doordash to hijack their brand, not wanting Doordash to crowd out their own in-house delivery, or whatever actual restaurant owners litigated these forced listings because they didn't want to be listed on Doordash.

e.g. https://boston.eater.com/2016/3/4/11160924/legal-sea-foods-s...