Mortal Kombat X DLC Tactic: Is It As Good As It Sounds?

Fixthisgame discusses the idea Mortal Kombat X had to allow players to play as DLC characters for free, which is presented in such a happy way, that we cannot help but wonder about their true motives, as well as the reason behind letting players use characters for free instead of just having them in the full game in the first place.