According to this logic, Taiwan should keep the most advanced chips to itself, the EU should keep the most advanced chip lithography machines to itself, etc etc.
I don't see how that is the case with the US and leading edge AI. The US has a lot of use for that, and on balance, I cannot think of anything that is more valuable than super intelligent AI. It's basically the end game power for the human race.
Countries could try what essentially amounts to unilateral sanctions on the US to try and force sharing, but it's unlikely it would go well.
By the way, China will lock it's super smart AI in house too.
This isn't a new idea either, both the US and China have technology already that they keep to themselves.
Many unlikely things happened the past 18 months in geopolitical terms, it was unlikely that Denmark would have to ready troops to send to Greenland to fend off American aggression but here we are.
Whatever was unlikely on the previous world order is up in the air now, no one knows how the USA breaking its alliances will shape the future world in 10-20 years. It turned out that it's also unlikely things will go well with the previous status quo, realignments are bound to happen.