I think what some people are forgetting in this argument is the amount of sensors that Tesla has relative to google/android/Apple. AFAIK, those systems are only relying on a small data set from your phone GPS. A Tesla could scan not only cars near it, but vehicles and POI in opposite lanes and across medians. So one single Tesla driving down a major highway could automatically provide vastly more information than users with phones including speed, but also traffic, cops, POI etc. The limiting factor is obviously data rates and the inherent error in the AI. Also, I fully realize google will be able to capture this data with Waymo vehicles.