Sure, all of humanity is inherently tainted by profit motives or whatever. That doesn't change the fact that trusting a Y Combinator startup with this kind of sensitive private medical information is a uniquely terrible idea. That information is going to leak, whether intentionally (maybe they'll "pivot" to selling it) or unintentionally via security issues like poor internal access control.

Doctors also earn money, but they're human beings with actual identities, not legal entities that don't even list contact information on their website, and they're at least sort of bound by professional oaths and privacy laws.