You ask why Google, Uber, Apple, Toyota, etc are all giving up on autonomous vehicles ? The answer is simple, they've seen what it takes to achieve it, and they've seen how far ahead Tesla are in achieving it, and they have realised it is game over for them.
https://www.teslarati.com/tesla-fsd-...ned-elon-musk/
Tesla's autonomous programme is delivering results and accelerating its roll out. The technology involved is very transferable to aviation.