Despite the seemingly natural fit, horror is one genre that is sorely lacking when it comes to AR. Sure there are games like Fatal Frame that had an AR aspect and ARZombies, which offers a Nazi Zombie type mode. But those are more action-focused, without the horror aspect that consumers desire.
While Bendy and the Ink Machine heavily relies upon environmental horror, the creatures in it would still work outside of the game. In the game, they follow you around without you noticing, which would work well to scare you as you walk around the house at night or out on a stroll. This would offer a haunting experience as you go through the day wondering where Bendy and the rest of the Ink Machine cast are hiding in the most unexpected areas waiting to spook you.