Except that they actually have a limited form of self-driving, which has proven successful over millions of miles of driving?
Comparing something to Theranos only works if that something doesn't have a working product. You can see that Tesla's autopilot works. It isn't perfect yet but it is a real thing.
If you were buying a car, would you not judge it by its merits, such as its handling abilities, safety, fuel costs, pollution, and ability to get you from A to B? That is the kind of consistency which most people look for when buying a car.
Can you give us some examples of all of this evidence?