The cheats in question were apparently aim-bots (similar to cheats Ubisoft has battled in The Division and Rainbow Six: Siege) that cost between $5 - $15 per month, according to Kotaku. The lawsuits began in October, but the age of one of Epic's targets has only recently come to light. There are a few other wrinkles to that as well.
In the elder Rogers' response letter (PDF), she writes that:
"Furthermore, Epic Games Inc. has released the defendants name publicly, therefore allowing news articles and different online publications to obtain his name and in turn release additional information. Referencing State of Delaware House Bill No. 64 it is illegal to release under age individuals' personal information by any agencies."
This, along with the fact that the gaming juggernaut is suing a 14 year-old, strongly suggests that Epic had no idea who it was suing. Rogers' mom asserts that the game's EULA states Fortnite should only be played by people who can enter "legally binding contracts under applicable law," and failing that, need to obtain consent from an adult. Yet, there's no age drop-down or consent tick-box on the form. She says her son never got her permission to play. Contract law generally prohibits entering into a business agreement with a minor, which would more or less make Epic's claims null and void.
Torrent Freak notes that while the younger Rogers didn't mod the source code himself, he did broadcast himself using the cheats on YouTube, showed others where to download them and then asked for donations from viewers. Epic pointed out that the video is key here, and led to the lawsuit in the first place. How's that? Rogers apparently filed a DMCA counterclaim once YouTube took it down.
An Epic spokesperson told Engadget the following:
"This particular lawsuit arose as a result of the defendant filing a DMCA counterclaim to a takedown notice on a YouTube video that exposed and promoted Fortnite Battle Royale cheats and exploits. Under these circumstances, the law requires that we file suit or drop the claim.
Epic is not okay with ongoing cheating or copyright infringement from anyone at any age. As stated previously, we take cheating seriously, and we'll pursue all available options to make sure our games are fun, fair, and competitive for players."
Meanwhile, Epic potentially faces litigation from PUBG Corp over the similarities between PlayerUnknown's Battlegrounds and Fortnite's "Battle Royale" mode.