There are food services that are commoditized and physical, they just don't necessarily look like restaurants. Food trucks, the popup at a food hall, hot dog carts, the NY deli, etc. These various forms are commonplace all over the world, they're just less common in parts of America because they were largely made illegal. Here's cops in Texas shutting down a lemonade stand run by two girls: https://www.cnn.com/2015/06/11/politics/lemonade-stand-shut-...

Food delivery, even with all the complaints about how much they skim off the top, how much they underpay drivers, etc. still makes pretty meager margins. And consumers aren't blind to it; I know a lot of people who have grumbled about how much there is in fees.