no, it would benefit the shareholders. The regulations imposed by the gov't (which is meant to be representitive) would reign in the excess externalization. Everyone would benefit from competition, when it does happen.
"Everyone" meaning "everyone as a whole", not absolutely every individual.
If there's more than one grocery store, I probably get better prices. (Or, negatively, if there's only one then I probably get worse prices.) And so with every other aspect of the economy.
So, if competition is supposed to fix other aspects of the economy, why is healthcare disproportionately high compared to other things?
There are several hospitals around me. Endless amount of doctor offices. There are several health insurance companies I can choose from. There is competition. Yet, prices are not affordable for most.
Fair competition drives out inefficient players, and generally can keep costs down for consumers. That's what it means, it doesn't literally mean every single person will profit, but competition makes for healthier markets than lack thereof.