In which they cheat and kill unskilled players for sport, just to get their kill ratio up. It's much worse in Creative competitive-like games. I'd say I've encountered a cheater in about 3 of every 10 games, that I know of of course. I've noticed cheating getting worse and worse over the the years. I've played this game ever since Chapter 1 S3.

The people in Reddit who 'firmly' deny that there's cheating in Fortnite are probably cheaters themselves, cheat sellers, or just Epic fanboys.