One reason those are broad is that our own filters are. We're interested in any dating site that also includes a solution to the chicken and egg problem.
BTW, by "Craigslist competitor" I don't mean a new Craigslist. I mean take one thing Craigslist does, and do it better. When you later expand outward from that, you don't have to expand into the rest of the stuff Craigslist does.