Dating app monetization creates a principal-agent problem: both subscriptions (for paid apps) and advertising/data-brokering (for free apps) are revenue streams that depend on people engaging with the app as much as possible — which people who actually manage to find solid romantic relationships won't do.
The only good dating app monetization model, would be a one-time-fee model. This would induce the correct incentives: as long as people are on the app, they continue to be a cost burden on the service with no further revenue — so, like people hogging a table at a restaurant, the service would be motivated to satisfy them and get them out the door!
But AFAIK, nobody has ever done this yet. (I think it's just because such a site would make so much less money than the traditional "milk your user base eternally" type of dating site. And people who build dating sites are usually in it for the money.)
