> For those of us not in the US, it's not that different. We are always at the mercy of tech companies from a foreign power.

That may be true, but the OP tweet (https://twitter.com/zachtratar/status/1571595169207812096) is referring to Americans specifically, and even for non-Americans, it's different for American-allied countries vs. ones with a more adversarial relationship. I don't think Americans would be concerned about TikTok if it were based in the UK or Italy, for instance.