Well it is news to me but hardly a surprise. Welcome to Abandonwareland, Mr Owncloud! You are in a good company. Gnome 2, GTK, Open Office, the list is just too long to continue. All abandoned the moment something "better" (in most cases, just "newer") came along.

The moral of the story? You have two options. Leave it to the professionals (that is, people who do it for money) or do it yourself. People who do it for the common good, whatever that may be this month, are just too keen to leave at the drop of a hat.