This is actually not possible. There is a set of laws called the "Health Insurance Portability and Accountability Act" or HIPAA. This prohibits us and anyone else to misuse your data and share them without your consent.
https://www.healthit.gov/topic/interoperability/how-hipaa-su...
Without specific explanations, you could always weasel out of vague promises.
Sorry to sound negative. I'd love a service like this, but there's a very high bar for responsible implementation (in my opinion) and VC seems very unlikely to be compatible with responsibility.
Basically, what is your business model? Are you only making money from subscriptions, or through other means? What are the VC's expectations?
I think you need to stop for a bit and think about what ethical behavior is.