This is a great article and a great taxonomy, but I dislike the title.

These seem like the normal ways that an open-source project fades and dies.

There are also several routes by which a project can be revived and reinvigorated. One of my favorites, because it's so obscure and also because I started the Wikipedia article on it, is https://en.wikipedia.org/wiki/Slirp#User-space_networking_an...