Pizza Arbitrage

The bizarre VC funded food delivery industry:

A pizza that he charged $24 for was listed as $16 by Doordash.

If someone could pay Doordash $16 a pizza, and Doordash would pay his restaurant $24 a pizza, then he should clearly just order pizzas himself via Doordash, all day long. You'd net a clean $8 profit per pizza [insert nerdy economics joke about there is such a thing as a free lunch].