According to two separate complaints filed to a North Carolina federal court this week (as spotted by TorrentFreak), defendants Brandon Broom and Charles Vraspir are connected to cheat provider Addicted Cheats, acting as support personnel for the site. They are alleged to have used aimbotting software "with the deliberate intention of ruining the game for other players and players who watch streamers."
However, neither defendant is being sued for the actual act of cheating; rather, Epic is suing both parties for alleged copyright infringement, arguing that the defendants' cheating is "infringing Epic's copyrights by injecting unauthorized computer code into the copyright protected code".
More at the link.
Seems like a pretty questionable interpretation of copyright law in my opinion. I also fail to understand why a permanent ban wouldn't be a more suitable option for cheaters.
Devil's advocate: wonder if this could be a basis for suing people that hack in-game currency for lootboxes?