Just annoying how it's always privatize the profits, socialize the risk.

The companies doing the mapping and algorithm develop do face significant legal and technical risk, and they’re unlikely to be bailed out. Perhaps the public is facing some safety risk, but this isn’t what was usually meant by your idiom of choice.

I disagree that they face significant risk, personally. But perhaps i'm just too much of a pessimist. To me, there is a safety trail involving everyone on the road, with no ability to opt-out.

The corporation will yield net profits from this, and the people will suffer the losses from this. That seems close enough to the idiom, in my view. But i'm no expert.

No, that would be open access to data, which is how science has made progress since time began. Or are you saying the scientific method doesn't apply to implementing self driving cars?