Here are my reasons:
The plot revolves around 5 dead children controlling animatronics who attempt to kill the security guard.
The main antagonist (William Afton) has a brutal death scene that contains huge amounts of blood.
The series is nightmare fuel with the jump scares and the Game Over screen showing the corpse of the protagonist, who went through the same fate as Afton.
The game currently has a "T" rating from the ESRB, along with this description: "The games contain frequent screams and jump scares, as players are attacked without warning. Some text/dialogue add to the dark tone and horror elements (e.g., "...[P]lease try to move away from populated areas before bleeding out...”; "...[I]f you die, they hide your body and never tell anyone"; "You will die."). A handful of mini-games depict small, pixelated pools of blood."
The movie also contains similar amounts of gore and blood, along with a PG-13 rating.
