"Starcraft" in the context of a porn video tag is likely a reference to the strategy game series called StarCraft, developed by Blizzard Entertainment. This tag might be used by fans who have created erotic content inspired by or featuring characters from the game series, such as Zerg, Terran, Protoss, etc., or simply as an inside joke among fans. The term could also refer to specific scenes involving video games or sci-fi themes, depending on the context in which it is used