But that only works if China reciprocates, which they show no sign of doing.

I’d imagine a Chinese citizen living, studying, or working in the US has access to a lot more advanced knowledge than a US citizen trying to do so in China.

Up to this point, the US has been the one with the advanced knowledge. We now face a world where the opposite might become true.

But using the previous example, I’d imagine a future hypothetical American going to China to study or work would face a lot more roadblocks to obtaining and extracting any advanced knowledge, especially anything with strategic importance.

It doesn't require reciprocation because it is a generalized version of the rebasing problem in software.

Over a big round table with cigar smoke in the air it's natural to come to the conclusion that the closed party can always outpace any set of open parties since it can take the public work and extend it with an advance that it keeps a secret.

In reality, we observe that open parties tend to win, or at minimum, if they lose, the closed party tends to have an entirely disconnected line of research that rarely incorporates ideas from the open party. In the rebasing metaphor, the reason for this is the free coordination an open party gets with other open parties. The closed party never gets to insert its advance into the shared state-of-the-art, so it loses all of the free maintenance of coordination, and it has to choose between paying the maintenance cost of integrating its secret advance with the public SOTA, dropping the secret advance and going back to parity with the public SOTA, or disconnecting from the public SOTA and going all hands in on its own ideas. The maintenance burden of integrating your ideas with the constantly moving SOTA may sound trivial but in practice it is usually prohibitively expensive if there are a lot of parties collaborating on the public SOTA and doesn't leave you with much time/budget to find new secret advances.

Right now in the US, we have all of the disadvantages of the open model: the closed parties of the world can cheaply take ideas they like from Meta, Google, OpenAI and mix them with private advances, and all of the disadvantages of the closed model: our domestic tech industry keeps all of its technology a secret from other domestic competitors, and gets none of the coordination benefits of open research / technology, independents and startups are not only unable to access information about the SOTA, but they are actively attacked by the existing monopoly players with any means available when they approach it independently, including using their access to massive capital to drain the talent pool, or being bought outright. And, as we are all too familiar with, the entrenched players don't even care that much about whether or not they can even use the talent efficiently, denying it to competitors is worth more.