Because then people would drill down and either find their perfect partner quickly, or figure out there's nobody compatible with them on the app quickly; and either way, delete the app.
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.)
I don't know if the timeline of events supports that entirely. Match.com bought OkCupid in 2011. OkCupid didn't start becoming Tinder-like until Match merged with Tinder in 2017.
There was also very little changes made to OkCupid core functionality between 2011 and 2016. Most monetized features predated the match.com acquisition, though I think the price increased at some point.
Because they all used to be that (see old OkCupid, match.com, Plenty of Fish, etc), but swiping apps stole the majority of their user base when they came around and every app had to become another swiping app to attract users. 9 times out of 10, the person being approached is gonna look at the approaching person's pictures and "basic stats" (age, height, kids, religion, job, education, pets, smoking) and decide yes/no. So what's the point of all the other stuff?
LokiList.com[0] is a free, anonymous online personals site intended as a replacement for Craigslist's Casual Encounters. It also allows searching by A/S/L[1].
