The GitHub blurb makes no sense. Even if N developers standardize their workflow on using a couple of remote repos to exchange work, that does not make the underlying system less distributed/more centralized.
> A Fossil repository contains not only the versioned files, but also a wiki, tickets/bugtracker, forum, chat room, blog/technotes - even the theme is part of it.
That sounds like a major design faux pas. It makes zero sense to tie a chat room/blog/e-mail client/alarm clock to a source code repository.