I don't agree that the argument implies nationalization. Regulation would work if it slowed everyone down at the same rate, enough to mitigate the risks. The problem is that you need regulators who know what they're doing and strong international cooperation. If you regulate a fraction of the global market, you just create an incentive to shift development to other countries. Nationalization, being essentially the most heavy-handed form of regulation, faces the same problems and comes with its own risks as well.

We're talking about this like all of the bad incentives are created by market competition, but that's not really the case. Most of the incentives come from untapped value in the form of potential profits, strategic advantage, military superiority, etc. Corporations and governments want to capture this value for themselves, creating various types of competition. Dario's argument depends on the assumption that the primary risk comes from the pace of development and threats from the technology itself. That's probably where I disagree the most; I think the highest risk is rising authoritarianism and competition between nation states. Slowing down isn't really a solution to those problems.