Why is fortnite So popular ?

Like you said, this is designed for young player, the graphism, The ton of skins like superhero or godlike and The DANCES ! Now anybody knows a Fortnite dance. And in the competitive the level is really high. When i saw the little brother of my friends playing, he is only 13yo but he is really fast in construction.

In conclusion, I think that fortnite is popular cause of his skins, gameplay and weekly update