On top of that, there's a pretty strong argument to be made that Fortnite is as much about socialization and open-ended interaction as it is a game. Apple banning what's potentially a next-generation social network from their platform isn't a great look.
A counter point is that it was an extremely reckless move for Epic to risk the banning of their next-generation social network (which to my kids, it definitely is) from the largest mobile store. Epic thought they were forcing Apple's hand, but they lost in court on the points they really cared about the most. And they got confirmation that Apple was well within their rights to cancel the developer account.
I'm not sure the risk was worth it... especially since they didn't need to take that risk to file the lawsuit.
From the first moments, Epic has been running a PR campaign, which doesn't really help you in court.
As an adult who's partner plays and plays occasionally, Its honestly really about group chatting (voice comms) with friends/relatives as much as it is about the game for us. I mean the game is silly and fun, but really its a group thing. I almost never play when not with friends.
And occasionally there are group events/ a concerts and movie screenings.
We're all on PCs/ Consoles, but if your a kid a free to play game your friends are on you could join in with a tablet, would be nice.