I will -never- own a self driving car unless the firmware is open source, reproducible, remotely attestable, and built/audited by several security research firms and any interested security researchers from the public before all new updates ship.
It is the only way to avoid greedy execs from cutting corners to up profit margins like VW did with faking emissions tests.
Proprietary safety tech is evil, and must be made illegal. Compete with nicer looking more comfortable cars with better miles-to-charge, not peoples lives.