The bigger issue is that figuring out good matchings is a crapshoot and users' self-described desires and priorities aren't actually in-line with what will make them happy. Everyone wants someone hot (almost by definition), and so the hot people get a lot of interest: the ones actually interested in relationships quickly end up off the market, and those remaining are more than capable of soaking up all the available interest.
I think the effect can be true without anyone having ill intent. The dating app companies are generally trying to make as much money as they can, which will indrectly lead to decisions that optimize for serial dating.
As a parallel I don't think Facebook is full of evil people who want to increase the amount of hate and anger in the world, but it does have a lot of people who just want to make money and encouraging negative reactions happens to be an effective way of doing that, so that's what we get.
I mean even OKCupid is being turned into Tinder, so it might not be so indirect after all.
Be real.