His mistake was that he used the company internet connection to upload said source files to something like his personal github or dropbox of the sort, so there were proxy logs of him stealing corporate secrets.
Most people would've gotten their personal-ish data off a corporate laptop with a usb key/harddrive which they probably wouldn't have triggered any alarms.
Most top banks use Citrix technology (or similar virtual desktops) to stream workstations for employees accessing both locally and remotely, so the only way you can get data out is by using your phone to take photos.
While most of such companies actively MITM their HTTPS connections (I wonder whether Google does that - theoretically they are CA so it would be extra easy for them), you could probably get away to uploading said file to any service that is small enough to be unknown to corporate firewall providers (Symantec, etc).
We're talking about reducing a ~$25000 part to ~$2500.
Just seems like a huge risk to save maybe $10k per vehicle (assuming price drops for everyone) for some relatively short time period.
An electrical engineer is also going to see the Uber name and expect Valley idiocy, while being a being a secondary concern for not being softwary enough.
[0] https://en.wikipedia.org/wiki/Sergey_Aleynikov [1] https://www.goodreads.com/book/show/24724602-flash-boys