You learn something new everyday.

"The US health insurance industry originated from a non-commercial plan founded during the Great Depression by a hospital in Dallas, Texas, seeking to shore-up its finances.45 That plan led to non-profit Blue Cross plans, which once dominated in most regions of the USA.45 However, in the mid-20th century, investor-owned insurers began outcompeting Blue Cross plans. "

www.sciencedirect.com/…/S0140673625016691

Hospitals were all pretty much non-profit and many are to this day. Many doctors did have private practices though.