It's true they haven't had a lot of real world impact, but it seems to be widely recognized in self-driving spheres that Waymo is #1, and they're valued at $100B (https://www.bloomberg.com/news/articles/2019-09-27/waymo-val...) which seems like a pretty good return. I think it's fair for them to continue plowing money into Waymo when the money they've put in so far people think could have returns.