I also once offered to build a mobile-application for Kalaripayattu martial art experts when I visited Kerala. I attempted my best but failed miserably.

I even launched IGNOU app on AppStore. But all I got was criticism & complains about IGNOU (nothing related to app)

Community driven apps or self-motivation-driven apps are always like this. You can't expect much because at the end, it lacks professionalism, motivation & above all funding.