How exactly would that work? Should the government offer to buy it for the asking price and then release it for free? What if the asking price is overly inflated because the government with it's endless budget is buying it? What if the government prefers to buy products that were developed in a variety of states and by a variety of people with different skin colors and chromosomes?

Or should it be illegal for researchers to sell these type of product? That will cause all of the brilliant talented people who need money to look elsewhere for work. I wonder if they will be able to get a competent team.

If we restrict the debate to children healthcare, I believe it is unethical to sell an app that could do great goods to many of them, at no additional cost to maintain or operate. The children are considered a vulnerable population, they will never buy themselves healthcare or even be able to.

However, this is a smart finding so the researchers definitely deserve some sort of reward, either in fame or funding.

Even if we restrict it to children, it doesn't change the basic idea. We can advertise food, education, housing and toys that are meant for children, why is a health app different? I doubt they the company actually wants children to buy their app, rather that parents will buy it for their children.