Some optimization needs to be done to get better score at search engines.
i don’t think having same kind of community in multiple instances with different content is good solution.
On the first point: If we have more people, we will have more content and more visits, and search engines will rank us higher. Hard problem to solve. A bit chicken and egg. Glad you raise it.
On the second point: This really frustrated me. I had issues knowing which manga community to join. In addition, multiple instances means multiple communities and means more fragmentation. If we could bring us all together…