EDIT - Sorry! It turns out Roblox actually didn’t sunset it. I will be getting mods to hide this now.
The allies and enemies features of Roblox groups has long been sunset, and the Roblox website no longer even shows enemies of a group anymore.
Yet there is still an artifact from that day - the enemy declaration switch.
Getting rid of it will help oblivious view group owners to know that group enemies are no longer a feature of Roblox anymore.