Yes but an Internet tech company has the potential to expand its scale without increasing its costs and so may, might be able to turn small amounts of money per customer into profits. A restaurant basically can't - food costs money no matter what. Selling food at below your costs may bring in customers but it will lose you money no matter what your scale.

Edit: (remembering article from years ago) A few, very few restaurants have been successful based on low-prices through economies of scale these are a very exceptional group I believe.