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If you squint your eyes just enough, insurance is like gambling... You are betting that something is going to happen to you, the insurance company is betting against that. The insurance company can improve their chances by adding conditions to that something.
That's the part that makes the US system insane.
In countries with a public health care system, the goal of the patients and the doctors is the same. Everybody's goal is to prevent diseases and sickness, and to treat it when it isn't prevented. The administrators just estimate how much funding is needed to achieve that goal.
In the US system, the patients are trying to prevent and treat their sicknesses and diseases. The administrators are trying to find ways to avoid paying for any treatments, and the doctors make more money if they can find a way to bill more things.
And, what's especially insane is that healthcare really isn't a normal market like other things. If you're buying a truck, you can shop around, haggle with salespeople, etc. If you're hit by a truck, you're not going to be comparison-shopping emergency rooms.
It's way worse than gambling. When you win a jackpot there are laws that require you to get paid out.
Insurance companies can just say no and fight you in court until you die because it's cheaper for them to pay some lawyers than for your treatment.