Tbf the mobile userbase is the biggest gaming userbase in the world. I know a couple people in my life who only play games on their phones and have zero interest in conventional gaming.

So is the Nintendo switch, Epic released fortnite on every imaginable platform, including my samsung smartfridge, so let’s be honest, the only real reason is that supporting the steam deck is directly supporting the store front they’re trying to go against, otherwise the dozen or so million desktop Linux+Deck gamers would have been acknowledged by Epic long ago.