Eight years and $10 billion later, GM has decided to pull the plug on its grand robotaxi experiment. The automaker’s CEO, Mary Barra, made the surprise announcement late on Tuesday, arguing that a shared autonomous mobility service was never really in its “core business.” It was too expensive and had too many regulatory hurdles to overcome to make it a viable revenue stream. Instead, GM would pivot to “privately owned” driverless cars — because, after all, that’s what the people really wanted. “...