To clarify the confusion...

The definition of autonomous I am using here is: "having the freedom to act independently" [1]

And in this context context I mean the car acting independently of the driver.

[1] http://www.oxforddictionaries.com/definition/english/autonom...

I wouldn't hold my breath. I refused to use the service when I first discovered it because it was facebook only auth. I believe that has since changed, but user privacy is not a huge concern of theirs.