That's because the people doing it think that decentralisation, privacy and censorship are primary features that will sell any old bullshit facebook clone site

That's because the people doing it think that decentralisation, privacy and censorship are primary features that will sell any old bullshit facebook clone site instead of being nice secondary or tertiary features underlying some new idiom that are transparent to users. Even if you managed that and then managed somehow to get funding to grow and scale for a system with no obvious revenue opportunities history shows us you are still likely to fail.