The blow, as usually happens, was struck suddenly and from the side from which Ubisoft did not expect it. It was not a game unlinking from server checking and not reversing the protocol.
Just gamers who bought a licensed game, and with broadband access to the Internet, reached the critical number of simultaneous connections and the DRM server collapsed as if from a DDOS attack.
I hope this will create a precedent and similar protection will be banned, as StarForce was previously banned.