It's not Fortnite that's the problem. It's Dungeons and Dragons. It corrupts the youth and will make them run around in robes and cast spells on people. Oh, wait... I'm 50 years too late. Oh, I know, it's listening to the devil's music, the one's they played in the 19th century with violins. It totally ruined the minds of people. Or... maybe it's the black and white TV? Or color TV? Or books? Or rock music? Or ...
I think it's a case by case thing. Not all kids do well with games, at all, and some will do just fine and grow up to young responsible persons. My kids grew up on games, and one is working as a developer at JPL (space rockets, and things like that), another works with AI, also relating to space and rockets, and the third is becoming a game artist and narrative creator, while the youngest two are still working on finding their goals. Meanwhile, I know a family where the kids weren't allowed to play any games at all, and they grew up doing amazing things as well. It all depends on family, culture, situation, etc. One mold doesn't fit all shapes.
With that said, gambling addiction is real, and making games into a gambling facilitation might be a social issue, just like casinos and horse races... or not...