It`s not entirely the same thing, you know, since you make a copy of the game, that is no longer contributing profit to the company who designed it. You don`t waltz into a store and pick up a package that`s at least 5 years old and walk out without paying; and you certainly don`t break into the house of a person who bought it and take his copy without paying him.
I don't know, but I believe someone said earlier that it's 75 years after the death of the copyright holder (in this case, Origin is the holder, so don't count on it). Of course, the copyright holder can voluntarily give the rights up, but that happens once in a millenium.
Actually, I can name at least 3 titles by the same company that were released as freeware at about the same time. These things happen more frequently than you`d think.