It's tough in the US because the one thing we have already going for us is a massive and comprehensive road network. Waymo et al are leaning heavily into the existing infrastructure, which is the right move given the inability of the US to execute major changes to infrastructure these days. Compare that to China, where infrastructure is being actively upgraded to accommodate autonomous vehicles. As nice as the Chinese approach sounds, it's probably a lot less exportable than the 'take the roads as they are' approach of Waymo.