In general, I don't like free stuff, unless it is air, sun ... from God.Well, I don't know if every young person is ready for a relationship. Twelve seems too young for anything serious, I didn't have my first crush until I was fifteen, and it took me a few months to realize it wasn't that serious and that it wasn't the big deal I made it out to be in my head, haha!
And I know plenty of people who met their marriage partner in high school, though maybe that's less true today, I don't know.
Also, I feel like "free apps" would attract people who aren't all that serious about dating. When I was on paid sites or apps, it always spurred me to be a bit more intentional and serious, and actually engage in mature conversation with people I was interested in. Just my thought, though.
With a paid system, usually things are more organized.
Is we use a service, we should contribute.