Why are you banned in Fortnite because of gta mod menus?

I don't know anything about it, but a friend of mine had some hacks in gta and was then banned in Fortnite how can that be? Are there 2 different games someone can explain that to me

Don't believe everything he tells you he's a Fortnite hacker kiddie

Either he is lying or the FN AC thought the GTA hacks were FN hacks