I think the person who wrote those questions is quite bias.
The gaming industry is broad and there's a large portion of it coming from an adult audience. So why assume teens or only focus on teens?
With that sad.
The game is appealing because it's free, more mature, tactical, popular due to hype.
The game is different for adding mechanics known from different games such as Dirty Bomb and Overwatch where your character can have unique abilities to change the out come of battle. And it uses a pinging system that takes away any required form of communications and effort.
None, they just play it because it's popular not because it's their favorite game per say.
Yes they will, it's been popular for 3 years now not including the Arma mods. Eventually like any hype and or craze it will fatigue and eventually die out. Great example the survival games such rust and ark.