Tesla showed prototypes of its Cybercab on Thursday. TeslaTesla unveiled its driverless Robotaxi at the "We, Robot" event on Thursday.Waymo's ex-CEO said Tesla isn't "serious about building a safe and accessible Robotaxi business."Some Wall Street analysts were also disappointed by Elon Musk's rollout.It seems former Waymo CEO John Krafcik was unimpressed by Tesla CEO Elon Musk's much-hyped "We, Robot" event.Musk revealed a fleet of prototype Robotaxis — officially called the Cybercab — on Thursday night to a crowd at Warner Bros.