Zoox is getting closer to a full launch of its robotaxi service in San Francisco. Last month, the Amazon-owned company started allowing select riders to hail its toaster-shaped, four-passenger vehicles for the first time. And today, Zoox is finally inviting members off its public waitlist, which it calls “Zoox Explorers,” to do the same. The gradual launch of the company’s robotaxi service is notable, because Zoox is one of the few companies to offer rides in a fully driverless, purpose-built