Markiplier’s low-budget indie horror adaptation ‘Iron Lung’ will open January 30 on more than 2,500 screens and shows are already selling out. Here’s why audience is the new infrastructure. Have you heard about “ Iron Lung ”? A low-budget adaptation of an indie horror game, booked to open on more than 2,500 screens January 30, with showings sold out weeks in advance? Probably not. “ Iron Lung ” is a self-distributed movie from a first-time feature filmmaker. No paid marketing campaign. The