If the four companies came together to start an industry organization and agree on safety protocols, I assume that would be legal done correctly.
I don't know that I know that for sure. But I also won't be surprised.
One way that I think about it is to look at what's happening in a completely different regime to see how they approach AI safety. So looking at China, how do they balance safety against freedom to develop the technology and how does it compare to our (US) approach?
(I think of China, not Europe, because there's not much AI innovation coming out of Europe so they don't need to navigate the tension to same degree as the US and China).
From the government side, the approach is mostly to monitor the situation and deal with risks as they arise, e.g. version 3.0 of the AI Safety Governance Framework https://www.tc260.org.cn/tc260/xwdt1/202609/e879077a3caa4722... was just released this month, now also covering "unintended autonomous behaviors."