IN THE PAST five years, autonomous driving has gone from “maybe possible” to “definitely possible” to “inevitable” to “how did anyone ever think this wasn’t inevitable?” Every significant automaker is pursuing the tech, eager to rebrand and rebuild itself as a “mobility provider” before the idea of car ownership goes kaput. Waymo, the company that emerged from Google’s self-driving car project, has been at it the longest, but its monopoly has eroded of late. Ride-hailing companies like Lyft and Uber are hustling to dismiss the profit-gobbling human drivers who now shuttle their users about. Tech giants like Intel, IBM, and Apple are looking to carve off their slice of the pie as well. Countless hungry startups have materialized to fill niches in a burgeoning ecosystem, focusing on laser sensors, compressing mapping data, and setting up service centers to maintain the vehicles.