None of those things seem relevant to The Peripheral at all.
If anything, I suppose it's odd that Flynne Fisher doesn't have a Twitch stream, but I could see why Gibson might not have gone there.
Firstly, it might end up dating the story prematurely. "Hold up Burton, I'm on my MySpace!"
Secondly, if Flynne was at all famous, the post-singularity douchebags would have found someone else. They seem to be trying to keep this quiet.
Also, Flynne is the viewpoint character, so it makes sense that she's normal apart from being good at video games.