I don't think those examples match very well. Theranos really didn't have anything that worked. Spacex has rockets that work and satisfied customers. They aren't going to Mars yet, but most of their current satellite launch customers probably really don't care.

And of the various self-driving car efforts, Waymo seems one of the most careful, both in their engineering and PR. I don't recall them making any claims they can't back up, but I may have missed some.