Tesla is good at designing cars.
They are not good at selling them, delivering them, or servicing them. Basically anything involving human interaction with customers.
So why would anyone want to give Tesla their insurance business given how bad their customer service has been with their cars?
And, as
@AltLogic stated, how do you give them your auto insurance business when you also need other lines of insurance, like homeowners, umbrella, earthquake, renters, etc?
This is just another goofy idea from Elon that never should have been approved by the board.