this is a closed system and easier to implement self-driving
Lol, they tried and it didn't work well, even in a closed system. There was a whistleblower among the drivers a while ago. They were officially in the cars just to keep an eye of things but in reality they had to take over constantly, and they all had contracts that tried to keep them from talking about it. Oh yeah and they got scripts they had to follow if passengers asked questions about Musk or the project. 😄
Edit: here's some articles: