[scarmig]

I'm pretty sure that if you somehow gave people an accurate filter for "loving partner who is looking for a long-term monogamous relationship underpinned by mutual care and affection," it'd instantly become the most popular one. But that's impossible to verify without weeks or months of dating. And there really isn't a good proxy for it, and if there were, it'd be quickly gamed.

I do suspect you could mitigate the market-for-lemons/selection effect by allowing filters on number of likes/matches and duration of time spent on the app: if someone has been on an OLD app for years consistently getting dozens of likes per day, they probably aren't a likely candidate for a long term relationship. But that'd be much less popular, because few people are willing to focus on potential partners not many other people want.