If I go to the App Store on my phone, and go to my "Purchased" list, Fortnite is still listed there. I wasn't up to date, and clicking on "update" gives the message:
"Fortnite" No Longer Available. The developer has removed this app from the App Store.
Interesting wording. I wonder if they only have one message for pulled-by-Apple vs pulled-by-dev? replies(4):