When he works for Walmart's Spark Driver delivery app, it happens a few times a week, he told Business Insider. They traced the problem to a Spark policy giving customers up to 24 hours to reduce or take back their tips. DoorDash's app lets customers only increase a tip or add one — lowering a tip requires calling customer service, a company spokesperson told BI. AdvertisementDrivers can wind up making far less than they expected once the 24 hours is up, a Georgia Spark driver told BI. A Spark driver there told BI his area had too many drivers and that tip baiting wasn't a significant problem.

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Persons: —, Dara Khosrowshahi, Spark, Yeji Jesse Lee, it's, Uber, they've, Brock Dickens, they'd, I've Organizations: Service, Business, Google, Walmart, Drivers, BI, Detroit Locations: Indiana, San Francisco, New York City, DoorDash, Carolina, Georgia, Oregon