Welcome back to TechCrunch Mobility — your central hub for news and insights on the future of transportation. To get this in your inbox, sign up here for free — just click TechCrunch Mobility ! Robotaxis are here! And yet, they’re not.  That contradiction neatly captures Waymo’s current reality. Anyone walking around San Francisco could reasonably declare that robotaxis have arrived. But arrival, even at scale, doesn’t guarantee permanence. Such is the dogged threat hanging over every company