Didn't go well for South America in the 60s and 70s but perhaps, as economists are prone to saying, "this time will be different".
The fact that a handful of individuals have half a trillion dollars to throw at something that may or may not work while working people can pay the price of a decent used car each year, every year to their health insurance company only to have claims denied is insane.
This money is managed by small amounts of people but it is aggregated from millions of investors, most of these are public companies. The US spends over 10x that amount on healthcare each year.
There are lots of problems with our current approach to healthcare, but insurers aren’t charging you way more than the cost to counterparty on that contract should be.