In mid-2021, Miguel, a 26-year-old living in Mexico City, had been working as a delivery driver for Uber Eats and DiDi when a friend told him that the Colombian grocery startup Merqueo was hiring. Just a few months before, in April, Merqueo had launched 10-minute delivery in Mexico and announced it would be investing $60 million in the country. The job promised stable hours and benefits — something Miguel had never had before with a delivery platform. He started work in…