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Believe it or not, venture capital-funded platforms like Doordash, Uber and others are actually losing money every day. The goal of many startups is to shake up an industry and create new ways of doing things, and their money-losing business models are ripe for exploitation. That’s exactly what writer Ranjan Roy discovered when his pizzeria owning friend received complaints about lacking delivery on Doordash.

As it turns out, the platform creates these listings to force businesses to participate, and menu items sometimes are priced incorrectly to boot. So when Roy noticed his friend’s pizzas were $10 cheaper than they should be, he came up with a plan. He and his buddy ordered pizzas from themselves via Doordash, which paid them the correct prices and pocketed the delivery fees. Over the course of a day, they made $75 in pure profit and continued to do this for 4 weeks. Doordash never caught on. A drop in the bucket, no doubt.