It doesn't want apps that jokingly call themselves "Crack Cocaine", "Crystal Meth", or "Mango Vape". It doesn't have anything to do with them actually promoting drug use, but it helps normalize illegal drug use in a way, while Apple wants to keep a "family friendly" approach to its App Store.
Honestly, if I were the creator I'd just rebrand it.
I remember coming across the app years ago, it wasn't obvious from the name what it did, and when I finally understood it, it just seemed like the creator was trying a little too hard to be "edgy". And if you want the widest possible usage/distribution of your app, "edgy" is usually not the way to go.