You place more faith in HIPAA than I do. HIPAA does not protect privacy to the degree that most people assume.
> There are numerous problems in healthcare that are too complex for individual health systems to tackle.
True, but that doesn't mean that Google is the right entity to do this. In my opinion, they're the wrong entity, because Google is not exactly trustworthy.
> Google is not the only player doing this at scale. They're not even the largest one.
But they're Google. What this sort of thing means for me is that I need to start asking medical providers if they're participating in this sort of thing with Google (or other companies that I consider bad actors), so I know which ones to avoid using.