For Uber I think it's obvious. For Waymo, well, to use the Words of former program manager Chris Urmson in a late 2015 letter to Sergey Brin (Which Uber's lawyers trotted out as part of their defense) "Over the past 6 months we have stopped playing to win and are now playing to minimize downside."

Waymo joins Tesla and Baidu as self driving car companies who have levied lawsuits over top engineers leaving their projects to become competition.