Uber CEO Dara Khosrowshahi faces what is shaping up to be a year of reckoning. Uber’s market capitalization has dropped $29 billion since it went public in May. It likely lost five to six times as much money in 2019 as it forecast in presentations to banks two years ago. And it has lost ground in its ride-hailing, scooter and food-delivery businesses, while regulators in cities like London are threatening its ability to operate.