This is inane bullshit. It's a video game. Kids have always fucking loved video games. I and most of my friends used to spend most of our free time playing video games when I was in highschool because they're fun. We now all have stable relationships and 6 figure salaries, and most of us still play a decent amount of video games.

Kids play a lot of Fortnite because it's a fun game with a compelling "just one more round" hook (you should try it, or PUBG or Warzone if you want something a bit less wacky, it's fun!). It's not that insidious. When I was younger my peers were just as obsessed with (pick one of WoW, DOTA, Counterstrike).