Why are all who like fortnite kiddies?
Game is free and easy to understand
 Are there on many different platforms
 It is colorful
 Battle Royale games are currently in vogue, such as Pokemon at the time
 Big streamers and Youtube push the game
 Constantly new updates and content
There are many reasons why it is successful.
Where the updates do not bring so much into the game
I'm not a fan of the game but the developers are very good for the community even if the PvE content suffers.
I'm not kiddi, for example. And I also do not think that only kiddies Fortnite play. Maybe there are many, but not all.
Free feel crass because you shoot in a game starting at 12 aka on the switch from 16