I think that's the actual complaint: the stone squeezing is happening at the expense of everyone but the customer or Grubhub. It'd be more sustainable for the actual businesses or the delivery persons if Grubhub took less of a cut or charged more of a delivery premium. (Implied: I value the sustainability of restaurants as more important than preserving the convenience/luxury of food delivery, and for edge cases where it's more of a necessity I'm sure we can come up with ways to address that.)