You were the perfect kind of ice cream. It's just the person who asked you that question asked 10 other people, and they hooked up either before you responded or from a better option.
It's kind of like going to a 31 flavor ice cream shop and taking a bunch of samples there's no commitment. They might get a cone, they might get multiple scoops from different types of ice cream, they might just walk out with the sample and not buy anything. That's life in the ice cream biz
Probably your best move. As best I can tell, (honest) people on those sites are trying to approximate the kind of background info you get "on referral." And from a business perspective, the service itself is just capitalizing on loneliness and taking advantage of how geographically scattered people are. So it's messy from the get-go.
Making friends and building a real, in person, social network is more effort but will yield stronger results. In the end, other people will be able to vouch for your social behavior which is something a dating site cannot do. And that goes both directions, too. As a bonus: you may get to see if your date's friends are good people, before you even go out.