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When you look at the amount of data one would have to sift through to find anything valuable, it’s a pretty big difference between TikTok & Zoom. Put simply, TikTok saves & distributes short video content. Zoom streams long video chats. The potential for gathering psychological data would be far higher with TikTok, and the barrier for entry far lower.

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We have computers that can automatically make transcripts. I'm sure china knows how grep works.

Are you seriously suggesting that its easier to gather psychological data from short videos than it would be from therapy sessions held over zoom? Why would that even be more valuable to china than the traditional industry espinoge that would be trivial to extract over zoom. Hell, why would you expect that short videos made for the express purpose of trying to gain popularity would be more telling about someone's personality than their candid work interactions?

One can’t just grep and understand millions of conversations instantly.

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