This piece https://www.readmargins.com/p/doordash-and-pizza-arbitrage still haunts me:

“In March 2019 a good friend who owns a few pizza restaurants messaged me (this friend has made appearances in prior Margins' pieces). For over a decade, he resisted adding delivery as an option for his restaurants. He felt it would detract from focusing on the dine-in experience and result in trying to compete with Domino's. But he had suddenly started getting customers calling in with complaints about their deliveries.”

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