No, they can "start enforcing subjective decisions" every hour of the day and always have been able to so do. And they always will be able to. There's no "fair" involved as regards a privately owned game. DCUO can and will enforce whatever subjective decisions they wish to, and they haven't the faintest obligation to care about what someone's opinion of what is "fair" is or isn't. It's actually pretty weird that people think they have a "right" to make rules for other people's private property. Since when is it "unfair" to own something? Or you a Proudonite?