No, I don’t think Fortnite itself is a problem.
As games go. It’s pretty tame and cartoony.
The problem is games, that encourage people to spend a certain amount of time on the game itself. Which Fortnite does. But that’s not exclusive to Fortnite. Most games do this. And to be fair to don’t even need to be on Fortnite that long over a week to get the rewards.
The problem is the rewards are seen as a bit of a status symbol amount the kids. Again, the problem isn’t exclusive to Fortnite. The longer you are online craft the more resources you can get, for example. It’s in most games.
when you add in the social aspect, you can get the FOMO effect. No one wants to leave their friends or be missing out when their friends are together. Again, this isn’t exclusive to Fortnite.
Then add in that it’s quite new and exciting
Then add in that your son is a teenager.
I allowed ds (12) to play during the lockdowns and was lucky that he loved it then and then got bored, because he had more time to play. I didn’t keep to screen time allowances too strictly anyway, but definitely was more relaxed during lockdown. But his computer is downstairs, so I can monitor him.
My brother was a huge gamer in the 90s. It really impacted his mood. We are talking mega drive/n 64 days. I saw his obsession and mood get worse the more mum and dad restricted it. It was the source of loads of drama in our house. Some kids are obsessive about this stuff and have been long before Fortnite or online gaming. Seeing what happened growing up I took a more relaxed approach and it seems to have worked. Ds might play for an hour or 2 at weekends. But always wants to have movie night or game night with me and dd if she is here (she is at Uni). He would rather take the dogs for a walk or go out to the beach.
My brother took the same approach to his kids, that mum and dad did and really restricts game time and at 13 and 11 they are terribly obsessed. Neither are allowed Fortnite. That bits obviously anecdotal. But I don’t think there is one size fits all to this problem. Sometimes restriction doesn’t help, sometimes being relaxed doesn’t. Sometimes one game might seem to set them off or non. Sometimes it’s a perfect storm of the game, socialising, newness and age.
But I don’t think there’s anything with Fortnite itself, that creates a problem.