Why can't someone create a public alternative to health insurance in the USA? - eviltoast

Health insurance at its core is very simple. You put money in, you go to doctor, insurance pay doctor. But in the USA, the insurance denies everything they possibly can. Money put in doesn’t ever see a doctor or your health costs, it goes right to the stockholders…

So why doesn’t someone just make a non-profit health insurance company where there’s no stock, no executives, just public servants and aggressive price negotiation where your medical bills are actually paid with the money put in?