There are so many dark patterns in for-profit dating apps, it's the app equivalent of a funhouse mirror.
For one, something like 75-90% of the profiles are dormant/inactive, but they're still shown as active profiles to give current users the illusion that there are lots of options in your area. Second, a successful dating app experience (assuming they're looking for something serious), means the user churns, so the app company is financially incentivized NOT to put you in front of people that you would likely connect with, at least without trying to extract as much money from you at first. Finally, the paid accounts have gotten ridiculously expensive, which drives real users away from the platform. And of course, they don't have to be transparent about any of it.
A non-profit app has much less incentive to (frankly steal) from their users because they're able to offer the service at a lower cost, without the need for the funhouse mirror BS, and could even provide meaningful aggregate community data on how many couples they've connected, etc.