The EULA that accompanies delisted Ubisoft games requires players to destroy their purchases. Stop Killing Games is fighting to keep titles working after companies abandon them. A major representative for EU publishers opposes solutions like support for third-party servers.
I know everyone loves to hate Ubisoft, but this is quite the common term. Also it only even applies when the agreement is terminated, I don’t even know how that would look like. I have never heard about a usage agreement being terminated, unless you yourself violate it (e.g. get banned for cheating).