The free market didn't deliver seat belts. Regulation had to step in and Ralph Nader lobbied the US govt to get it passed.
The part we should be worried about is that it took 9 years for the govt to require it. 50 years from now, we'll be talking about how stupid it was that drones didn't have safety features.
Volvo had them standard, but Volvo has also never been above 1% market share in the US [1]. If a tree falls in a forest and nobody is there to hear it, does it make a sound?
[1] https://knoema.com/infographics/floslle/top-vehicle-manufact...