https://www.vice.com/en_us/article/4avyzq/walmarts-gig-workers-are-struggling-to-survive

Last November, a single mom with a toddler in Spokane, Washington, signed up to work for Spark, the Walmart-owned delivery platform, because she heard it paid well and didn't require lots of social interaction. She could pick up already-packed orders in her car, without any of the shopping required by apps like Instacart or person-to-person contact required by Uber and Lyft. In the beginning, she brought home $700 a week.

But less than a month into the job, her income plummeted. Lucrative $15 orders were snatched up by other drivers before she could claim them; often the loading animation on the Spark app, the Walmart logo, would spin endlessly when she tried to accept an offer and get scooped up by another driver. Drivers called it “the spinning wheel of death.” When we spoke in April, she said she was lucky if she brought home more than $500 in a 30-hour work week, and relies on tips as her main source of income.