I'm posting this in "Law" because I'm specifically not looking for economic reasons.
Here's the context: Imagine people were very highly motivated to provide healthcare to anyone that needs it, so they start the equivalent of a national insurance that indiscriminately gives money for those who don't have it and need it. Basically, they do what they'd want the government to be doing, but as a non-government institution.
I did try some research, but found nothing close to this proposition, aside from a post here. Other things all refer to the high cost, so I'm wondering about other blockages not related to cost. In other words, if people were willing to pay the price, could it be legally done?
Would there be anything, aside from monetary cost, preventing this from working?