This argument is flawed, because when regulators investigate a Tesla crash, Waymo doesn't care the slightest. The technologies (emphasis on having skeuomorphic cameras vs a lidar), approaches (emphasis on generating as many situations as possible in simulated worlds and carefully transitioning to the business case vs testing as early in the real world with background data captation) and results are so different between the actors in this specific industry that one's flaws being fixed or improved won't necessarily translate into others benefitting from it.

Conversely, when Waymo iterates and improves their own safety ratios by a significant amount, that evidently does not result in Tesla's improving in return.