[Angostura]

They count. But they aren't subject to network effects. There's no 'I can't moderate this site, because none of my friends use it' issues.

[hombre_fatal]

Of course there are network effects for moderators. One major reason people volunteer to moderate Wikipedia is because it's in such ubiquitous use.

A fork of Wikipedia with no community is just a content mirror and, because of network effects, you'll have an incredibly hard time attracting anyone to help out with it when they can just go to Wikipedia.