> Funnily enough I met my current partner on OkCupid, which seems like antiquated by modern dating app standards.
There's a bit of demographic selection here (people who are likely to use OkCupid may be more of your type), but OkCupid's whole proposition, early on, was gathering a boatload of information about you, via personality tests and data experiments, and hopefully presenting people who are at least likely to keep a conversation going.
As teirce points out, the see picture, swipe dynamic of mobile-native apps is more conducive to casual encounters. It certainly puts more weight on physical appearance and status signals.
OkCupid used to publish detailed posts about their experiments, but I can't recall what ratio they found of "people who are contacted frequently" to "people who mostly initiate contact", but I'd hazard a guess that it's much higher on Tinder. Such an app tends to be winner-takes-all, with a long tail of people who are mostly ignored.