Re:Owncloud has been forked into Nextcloud
by jwildeboer on Thursday June 02, 2016 @12:33PM
(#11823874)
The direct explanation is at http://hintjens.com/blog:117#toc47 but you should read the whole post. Or even better the book Social Architecture.
The project SHALL NOT use topic branches for any reason.
This is a main tenet of git-flow, and it's hardly uncommon.