Many are in Fortnite Tryharder why?
Because they want to win?
I do not understand your question somehow of the general sense. Although I do not play the game, quite a few play the game and seem to enjoy it. They probably just want to make a career like this "Ninja" since he came out big with Fortnite. Each player is different and different in different games.
But that you have asked this question I can't understand somehow.