I signed up in my 20s. They admitted I was young versus their median, but I wasn't alone and had plenty of dates in the few months I was a member.
There was a lot of appeal to the idea of not dealing with the usual grind of the average dating app, and getting something a bit more personal/high-touch.
(Though even then it seemed apparent that it was less high touch than it seemed for the cost, and the real gatekeeper was the cost.)
There should be ways to sell human-moderated dating apps (Blind Dates as a Service) to young people just on how dumb and how much work even the "swipe left/right" systems are. Figuring out how to scale that cheaply definitely seems to be the impossible problem.