That would be valid if Tesla is really collecting all of that data. But the people who have done analysis of what the cars sends back say that what is actually

That would be valid if Tesla is really collecting all of that data. But the people who have done analysis of what the cars sends back say that what is actually sent is very limited statistics on times, locations, and general characteristics of disengagements (speed, direction, list of detected targets, etc). This is doubtlessly useful but it's not something you can just drop into training a neural network or even be sure exactly what the issue was. They can write query strings for very specific situations they're interested in, too, and receive video frames. On the other hand, Waymo is gathering vision data on every drive, and ground truth LIDAR data.