The biggest issue, that we have around here, is that GH, and a few other outfits, SEO-spam their listings, sometimes, using branding elements taken directly from the restaurant's sites, and force themselves to the top of searches.

If there are any issues with the order, I guarantee that GH does a quick dash for the door, leaving the restaurant holding the bag. The problem may have occurred anyway, but the customer was actually GH, not the person who called GH.

GH made a sale, got a commission, then didn't have to stand behind their sale.

It may not be illegal, but it is not-nice.