Old man yells at cloud time: I feel like naming yourself "Ninja" is something a 7 year old would do. I can't take it seriously. It's like naming your BG3 rogue "Assassin" or your music group "Guitarists".
But also I stay away from all influencers, so I don't know what's going on in that world.
What about band/musician names? Isn't calling yourself The Boss, or Satchmo, or Hootie and the Blowfish, Toad the Wet Sprocket, Led Zeppelin "unserious"
I mean, it's not an influencer thing, it's a common sense thing. His username on twitch used to be NinjasHyper. Common sense dictates that this is a fairly normal username because of the nature of usernames. Common sense also dictates that when addressing someone who you only know by the internet moniker of "NinjasHyper", you're going to call them Ninja or Hyper.
I expect most people don't stick with their nickname from when they were a kid. The kid we called "green shit" (because he'd always play luigi) isn't obligated to carry on that name. I mean, we lost touch, maybe he is, but somehow I doubt it.
In fairness, I can imagine her channelling her inner Lucille Bluth if she was asked by one of her staff if she wants to be in Fortnite for some sum of money.
It's very much a "nod your head to receive free money" situation.