[checkdigit15]

I wonder how much of that is due to the strong disincentives to misuse of health data by providers.

I suspect many people are more willing to be honest with health care providers about illegal or embarrassing or “wrong” activities because they know there is legal protection and harsh sanctions (e.g. loss of license, prosecution, requirements for professional education and exams in ethics as part of education/licensing, etc) if the provider breaches that trust. That sort of thing isn't typically present in the tech industry.