It doesn’t mean anything at all.
https://www.epicgames.com/fortnite/en-US/news/the-fortnite-m...
Anyone who wanted to flout any rule could claim Apple was playing favorites with Epic.
It has nothing to do with being screwed out of $2 per purchase of in-game currency.
https://www.epicgames.com/fortnite/en-US/news/the-fortnite-m...