Why is mathematica not attracting crowd
projects?
There's an interesting article related to this in a recent issue of The Atlantic magazine. It's about the future of the scientific paper (as a medium) and then compares the approaches to this taken by the teams responsible for developing Mathematica and Jupyter notebooks. In other words, it's much more a discussion of two cultures (cathedral vs. bazaar is called out) than of two products and their respective features sets.
It's worth reading never mind its silly title. The site requires you to turn off adblocking to read it (or just temporarily disable javascript in your browser).