Ihave to agree on Djenty on all this.
Cupcakes did not scare me, just made me want to puke my guts out. Same goes for trixies fun house, sweet apple massacre and all the other big Mac the murdering rapist stories.
Then you have stories like rainbow factory that aren't scary just more less thrilling.
I dont think I've ever read a good grimdark fanfic, and if I have it wasn't god or worth remembering.