Zoox is picking up momentum judging by monthly active users, according to data from Apptopia. Jay Janner/The Austin American-Statesman via Getty Images Alphabet-owned Waymo has long had a size and time advantage in the robotaxi world. A new report shows Amazon-owned rival Zoox gaining users, though. Zoox has grown its number of active users so far this year as it started operating in new cities. One robotaxi provider is picking up speed against the competition. Amazon-owned Zoox grew its share