Five years after its $1.3 billion acquisition of Zoox, Amazon has officially entered the U.S. robotaxi race, which to date has been dominated by Alphabet’s Waymo. Zoox’s first public launch kicks off today on the Las Vegas strip. The company is offering free rides from a few select locations, with plans to expand more broadly across the city in the coming months. Riders will eventually have to pay, but Zoox said it’s waiting on regulatory approval to take that step. Amazon is jumping into a market that’s all about the future, but one where Waymo has a major head start,...