This is that part where people trying to bail on Reddit need to remember that this is NOT Reddit. Lemmy is similar to Reddit but is not designed to replace Reddit as a SINGULAR centralized entity ^hence, yknow, all the decentralized talk.^
If you only want one server, with one set of communities, there are alternatives in the works. If you want to use Lemmy, you need to shift your expectations. The entire point here is that while one c/aww may "win," you can still have your own c/aww on your instance as a completely separate entity that can be ran and moderated differently by different people, and person C can have their own c/aww again independent of the others.
You can follow one, you can follow all, but they remain separate communities on separate instances.