That plot is is incredibly unoriginal and they added a layer of reddit on top of it. Are creepypastas even popular anymore? That last time I remember hearing about them was somewhere around 5 years ago. They should just remake Tales from the Crypt with Day's withered husk of a husband as the Crypt Keeper.
That "pooka" shit is so unoriginal it was the plot of a terrible movie from just a few years ago, The Bye Bye Man. (The short story it's based on, "The Bridge to Body Island," is actually pretty creepy.)
Also, that cast list, oof. Adding that to my "must miss" pile.