How do you hear that? It's basically a guarantee, and companies generally don't warrant against things they know will happen. The reason you get a 1 year warranty on things is because they are engineered to not break down within one year. After that, the incidence of failure goes up.

"We will pay for any accidents caused" means "this will not cause accidents". Because no company would do that unless they were sure it wasn't going to happen. Just like when Google gives $100,000 for bugs in Chrome. They wouldn't say that unless they were sure there were no or relatively few bugs.

Another interpretation of the Google bug bounty is that fixing bugs of a certain kind is actually worth $100,000 to them (but you're right that it would be hard to sustain if they expected to make thousands of payouts at that level).

It's already common for automobile manufacturers to explicitly market the collision safety features of their cars. Many car commercials have collision test footage.