A shot from One Piece, one of the animes that Funimation made DVDs for. How long is “forever”? When it comes to digital media, forever could be as close as a couple of months away. Funimation, a Sony-owned streaming service for anime, recently announced that subscribers' digital libraries on the platform will be unavailable after April 2. For years, Funimation had been telling subscribers that they could keep streaming these digital copies of purchased movies and shows, but qualifying it: “forev...