I’m curious about this too. I’d worry about a local burglar having this information, but what can a Chinese tech company do with this data that I should be concerned about?
Second, why assume a random Chinese tech company will manage to keep this information to themselves? I wouldn't exactly bet against some terabytes of videos appear on some torrent indexer. Now, combine with modern AI tools for sifting for what you are interested in, and it might hit closer to home for someone.
I never assumed American companies kept this data to themselves so nothing has changed in that regard.
I don't really care if the camera is American or Chinese, I just don't want a camera/mic in my home that I don't control. And yeah, the smartphone counts but it's a lot harder not to have one.