Board Thread:Fiction Universe Discussion/@comment-37630119-20191017210240/@comment-47205-20191017211406

Private universes, as we usually mean them (in particular, in the sense of a universe in which you don't have to abide by all the fiction rules), are not part of some "fiction multiverse" that includes the collaborative fiction universe, so no, they can't clog it up and yes, you can have any many as you like.

We're not going to arbitrarily force you to put all of your private fiction in one universe. The rules tend to exist to make sure collaboration is fair on everyone, so when you're not collaborating they don't matter.