I think you're not understanding the full implications of the app. The decentralization is what enables the app to have the incentive structures that it does. The incentive structures is what makes the app potentially more effective than something like OKCupid. The problem is matching people up is not a process which favors a centralized approach.

People typically rely on their friends, or people they know to (friend of a friend) to introduce them to new people they might want to know. If you don't know anyone then you cannot take advantage of this method at all. With this app you don't have to know anyone to take advantage of a similar mechanism.

I don't have to know you to introduce you to people worthwhile to you because I'll have the incentive to make the introduction. This means you don't have to go to endless conferences, or join clubs, or gangs, or cliques, or any of that. The person you need to know will potentially always be easier to find. And this also applies to businesses looking to recruit people who would be the greatest asset to their company.

Can you do a dating service without a blockchain? Sure you can. But it would give too much power to whichever central authority runs the dating service over the participants using the service. It would take away privacy which people might want, it would make it hard or impossible to have incentives, it wouldn't work as well in my opinion because I don't think friendship, love, or finding employees/clients/peers is a centralized process today. Can you name a centralized service which effectively does this that we can all use equally with privacy? Is there any incentive for people to share their social wealth in centralized services?