I doubt it is good for society for such apps to exist in the first place.
I suppose that could be the case, however I am fairly unconvinced that this has any real affect on the population in comparison to the cost of having a child coupled with the rise of understanding the costs involved with having a child.
Our Childless, Childish Culture By MADELEINE KEARNS August 8, 2019 3:34 PM https://www.nationalreview.com/2019/08/our-childless-childis...
In the Western world and Asia, fertility is below replacement world, and in the Western world, the fraction of children born out of wedlock, who do worse than children of married couples by any measure, is rising. So I think working on something like eHarmony is much more moral than the app discussed in this thread.