I've worked for a dating startup in the past and the main barrier is marketing costs. You need to be able to bootstrap a network extremely fast or people will join and bounce within minutes and doing that across any sort of region costs a lot of money since you basically need to blanket advertise. Trying to do that across multiple regions requires serious money.

You can build it and they might come but they will leave and never come back if they aren't seeing people to match with.