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The thing to understand is that vtubers are failed people. They're weird, socially awkward, ugly, unskilled, anime dweebs who suck at everything. By sheer random chance, a couple of these people land in high-paying agencies. So of course their story will be "I just floated around from thing to thing without even trying to hard and it worked for me!". But that's just "survivorship bias", what you aren't seeing is the 200,000 others who's lives ended in a ditch.
In truth you have to be fucking stupid to take advice from someone like that in the first place. They don't know what they're talking about.