Some kind of food really doesn't travel well or needs to be eaten soon after being prepared, and customers frustratingly mentally take it out on the restaurant

Some kind of food really doesn't travel well or needs to be eaten soon after being prepared, and customers frustratingly mentally take it out on the restaurant instead of the delivery platform. The results in a ton of complaints and even lost future customers. These complaints are extra brutal because they might be left on Yelp instead of merely on GrubHub. There are also apparently a ton of cancellations via GrubHub, so the restaurant can end up eating the preparation cost of a bunch of orders. Things can also be super confusing for restaurants that don't have an essentially-permanently fixed menu, because GrubHub will result in a ton of obsolete menu items being ordered by people who then have to talk to the restaurant in frustration. This last bit can be fixed if you pay GrubHub to become a "partner", but now that's a complex business model decision that might simply not make sense for every restaurant.