It’s not mysterious and amorphous. We have seen the results with social media for what? 15 years now? This is a known issue with clear parallels. And health data is way riskier to have floating around.

I have chronic back pain that everyone knows about. It's not a privacy issue for people to know about it, why would it be? Genuinely don't understand how that gives a shadowy cabal of information brokers leverage over me.

That's obviously a take from someone who never suffered chronic pain. If you have a life-long mystery illness that doctors don't care about, obviously you're going to give your data to ChatGPT Health because at least, it looks like it's listening...