I think there is a more nuanced perspective to take on this debate than just profit motive. If they believe that this version of "AI" is actually becoming so dangerous that there is a real risk of it falling into the wrong hands, then it makes sense that the American labs would try to convince the US government to work on a joint "AI non-proliferation" agreement with China much the same way that nuclear weapon technology came to be restricted by the ones that already had the capability.

This would achieve their regulatory goal of capturing the market, but also the geopolitical goals of USA and China to essentially "techno-colonize" the rest of the world between themselves.

So I think there is definitely a profit motive and a risk of seriously diminishing returns for the actual labs, but there is also a nation-state motive to start pulling up the ladder.

I think in all of these debates people lose track of one of the major vectors of threat, as you said, other humans. From my point of view this is an ever bigger problem with this tech, like orders of magnitude bigger.

The current setup we find ourselves in is based on a very important detail that is easily lost because it is so old we don't really think about it. There is, or rather was, an incentive for more people to exist, because they are valuable for work and defense.

Some people wrongly use the industrial revolution to argue against AI completely replacing human work, but that is very wrong. What is happening with AI has nothing to do with the industrial revolution, as equivalence. Back then you'd just free up humans for higher level work. Now, theoretically, anything you could ever think a human could do, AI would theoretically do better. So no matter what job you come up with, using AI instead of a human gives a better outcome, cheaper, more reliable, faster.

Coming back to initial subject, one thing that kept everyone in check was our inability of actually wiping everyone out. Sure, we had nukes but they ruin the Earth so nobody can inhabit it if they all go off. But with AI, centralizing so much power up top, and taking it away from regular people...that is the biggest danger in this scenario, by far. Not some rogue AI, rather rogue human groups that have the power and technology to do away with basically everyone else, or a good bit of everyone else.

This threat is way bigger and never addressed. Like...suspiciously never addressed.