Unfortunately I think projects like this have extra challenges over even regular social media platforms. There's also retromeet which seems even more dead (it may have not even made it to a stable release).

The idea is great but for a dating app to work, it needs to quickly get past two network effects: the global network effect (there must be enough people globally, or in a larger region, to get other people interested in trying out the platform) and the local network effect (there must be enough people to match with in most users' local areas to keep enough people interested). With corporate backing that's easy enough to do with a dedicated team to market and develop, but FOSS rarely has that sort of manpower. Slow growth is hard too, since users tend to leave dating apps quite often.

There's also the funny problem if the dev gets a partner usually the partner doesn't appreciate them staying on dating apps. Developing a dating app could be even worse for the relationship... actually now that I think of it, maybe I should make start a similar project since I don't like dating...