Paper was never designed to be a Facebook replacement, but a PoC in engagement through UI using Facebook. The released a lot their findings and tools to the OS

Paper was never designed to be a Facebook replacement, but a PoC in engagement through UI using Facebook. The released a lot their findings and tools to the OS community as well (Tinder took their animation mechanics). Btw 1 billion DAU would have never agreed to that level of rethinking for the app.