“While it’s fairly common for games to be delisted on digital storefronts, the title being unplayable completely is not.”
Steam’s notice said owners would lose access to the game entirely on September 1. Ubisoft walked it back after the backlash, and now only DLC and online features die. The first notice was the honest one. You don’t own a digital game. You rent it until the publisher decides the servers cost too much.