Iirc they also use BattleEye in addition to EAC, so depending on their implementation it might not be as simple (unless they put in some work).

Epic talks about anti-cheat on Linux not being good enough for them since they aren’t kernel level. Which might be fair since Fortnite is big, altough most people probably won’t change their OS while cheats are also available on Windows anyway. At the end of the day Fortnite is only one of many games which don’t support anti cheat on Linux for whatever reason.