Catanzaro: GNOME 3.22 core apps

One reason that it's been removed from the default install of Ubuntu GNOME 16.10 Beta is that empathy still hasn't been ported to webkitgtk 2. webkitgtk2 receives regular security updates and advisories unlike the older webkitgtk.

The other reason is that it doesn't support the most commonly used chat services (because chat providers closed their protocols). Because of this, there's less investment in maintaining empathy and its libraries.

It was already removed from Ubuntu (Unity)'s default install for 16.04 LTS for the same reasons.