US has some if the biggest PE (private equity) firms in to the world. Their revenues exceeds well over billions of dollars a year, keeping their investors happy, super happy.
PE firms usually buy businesses that are struggling and turn them around after making cost cutting measures. Sometimes they sell these companies for a hefty profits or in some cases they hang on to the profit churning machine. It all depends on the market conditions. Whatever is more profitable wins.
Until 1970, almost all hospitals in US were owned either by religious organizations or some type of Charity. So it was more or less a very simple, straightforward, not so capitalistic business. They would get money through taxes and charitable donations and in return they help the sick people, Simple.

About the author.
Albert is an ex-royal air force photographer. He is passionate about novel writing and creative arts, his work can be seen on Amazon and Opensea. Albert also enjoys macro photography displayed on Instagram and gaming with his son and records them to replay on YouTube.