Many studies find that a majority of personal bankruptcies in the US involve medical debt with some estimates of ~500,000 medical-cost contributed bankruptcies per year. A hospital (might) not kick you to the curb if you are dying in their emergency room. However, this is not the same as catastrophic coverage.
It is functionally the same for the recipient of the medical care who wouldn’t be able to afford it out of pocket. You get the medical care, and you don’t pay for it. Then declare bankruptcy if you have to.