Because when people don't get exactly what they want, they blame the restaurant instead of the Grubhub employees who messed up. The restaurant loses business, grubhub makes a quick buck.
It's at the very least a trademark violation, this is exactly what trademarks were set up to prevent.
You’re allowed to use a trademark to factually describe a product. If I have legitimately bought an iPhone and I’m offering to resell it to you I can use the iPhone trademark to do that.
It's at the very least a trademark violation, this is exactly what trademarks were set up to prevent.