But this is a 'cart before the horse' situation.
What evidence do you have that providing your health information to this company will help you or anyone (other than those with financial interest in the company)?
There is a very real, near definite, chance that giving your, and others', health data to this company will hurt you and others.
Will you still hold this, "I personally don’t care who has access to my health data", position?
I personally have been helped by talking to ChatGPT about my healthcare. That's the evidence. I will take concrete positive health outcomes now, over your fears of the future.
I’m definitely a privacy fist person, but can you explain how health data could hurt you, besides obvious things like being discriminated against for insurance if you have a drug habit or whatever. Like, i’m a fitness conscious 30 something white male, what risk is there of my appendix operation being common knowledge or that i need more iron or something?