You can find Fortnite hacks anywhere. If they're free, just because of the sheer popularity of the game: You'll get banned real quick. If you pay for them, you'll never really get banned, but depends on how expensive they are and how well known they are. Usually the paid ones last LONGER but are not completely ban proof... Much like with CS:GO hacks and cheats.
"It never hurts to keep looking for sunshine" - A. A. Milne