(my) general feeling is that these dating apps works mostly for people who dont need them in the first place anyway... spoiling it for everyone else
one thing i think where dating apps help (or being introduced by someone as potential partners) is that you can discuss relationship goals very early. that helps weeding out unsuitable candidates quickly.
An additional anecdote though as an in-between of both of ours: my mother in the UK met a man from Canada in a chatroom over twenty years ago, divorced my father, and they're still married. Not to say that it has always been smooth sailing at times for them (he's got paranoid schizophrenia, she's physically disabled now), but they're happy, so meeting people via software evidently does work for some people.
I mean, look at us, we don't know each other, but we're having a conversation, so if that idea is extrapolated to a dating app, sure, I can buy into the idea that they can be effective for some people.