He plays COD online, so he meets young people on the internet. Later he "radicalizes them". But is more true to say he simply tests the waters, he launches some cultural symbology around, tosses some memes. Some youth will already be quite radical on their own, Mark wont have to do much at all.
A lot of teens become communazi on their own, because they are socialized on the internet in communities that teach them the endless repetition of nword is fashionable. They derive a false sense of dionysian liberation by say jew this cuck that, nigger fuck you so on. And they are already watching all the tiktoks of fuentes and sewell.
So these shitheads are dumb mother fuckers already, but mark collet knows how to manipulate them. He simply offers them visibility, he presents them as "the right wing youth" or "th new future thought leader", this gratifies the shithead teenager, he feels listened to. The shithead teenager will feel welcomed to finally put to use his already bulit communazi assumptions.
Why are all these shithead dumbasses found on call of duty? As I said before, because they are normies. COD is a massive normie magnet. Simple as.