This explains a lot. I guess i'm one of those who enjoyed Jace with a semi-conscious suspension of disbelief. I tend to look at a lot of these situations (Peter Coffin for example) not really caring if it's real or not, just enjoying it for the entertainment value.
But as folks have said, this explains Tupacalypse... but also things like Tyce's de-evolution from coherent twitter using teenager to someone who legit thought anarchist was written as fucking analchest and thought he could get high by smelling his own shit. Not to mention carting around a wagon full of matchbox cars? I don't know, i'm with the people that think this isn't all straight up fiction either, so some of these things could be real, but all of them?
And the way the streams always culminated in a third-act, satisfying event?
And not to be a dick, but the way DD (who I like, honestly) would defend Jace's realness with such veracity and venom always struck me as a sign that something wasn't on the up and up. Either because he was defending the ruse (most likely) or had sunk so much time into it that if it was fake he'd have to really question himself and what he'd been doing with all that time.