On the thing Sifu does where he acts as if there's a chat asking him questions. I have had thoughts about this for awhile. I think there's actually 2 factors going on. As an example I'd like to use my pet schizophrenic from rdrama, jinxthinker. When I say he's schizophrenic I'm not saying that as a funny exaggeration; he literally hears voices and noises and reacts as if they're there; he connects random unconnected phenomena in his mind and assumes they are part of a singular unified system; he believes that there are large, vast conspiracies which exist specifically to persecute him. Here's a clip of him doing his vlog. For context, he's not a streamer or attempting to be a streamer. Aside from a 2 week span in which he tried to be a Crusader Kings II streamer on Twitch (he quit because it was too exhausting), he has always recorded videos and manually uploaded them to different websites.
This is a clip where he does the same sort of simulated dialog thing that Sifu was doing. It's just the first one I could find.
He's on one of his usual topics (hatred of whites/europeans) and suddenly just asks himself a question: when was the last time white people had God's favor? Then proceeds to answer it. In other instances he stops mid sentence and looks to his side as if there's someone off camera asking him something; sometimes he repeats the question and other times he doesn't even, he just transitions to a new topic as if his video audience already heard the question.
I believe this and what sifu are doing are both
1. Simply how schizophrenics process their thoughts. They hear their inner monologue/train of thought as if it were an externality and sometimes default to treating their thoughts as a separate person/entity- hence why some severe cases think that they're literally getting communication from God/aliens/spy agencies
2. I think, at least with the very online schizophrenics in current year who are often low IQ/low agency individuals, they are modeling their behavior after streamers. They're often isolated and only exposed to online personalities as an audience member. This being their primary form of social interaction my be slowly retraining their brains to think that this is simply how people act and they change their behavior accordingly to comply to these warped ideas of social norms.