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Her entire comment section is teens and young adults who grew up with her videos thanking her from the bottom of their hearts for being so kind & sweet.
She was a major part of an entire generation's childhood, such that they're nostalgic for entire "eras" of her time on YouTube.
Other vtubers who reincarnated, they didn't have that. Many have been on the Internet for as long as her, but it's a pure novelty to go back to their PLs, whereas kids who discover her potential new form might unlock a core memory when they hear such a familiar voice.
That's staying power, that's marketability, that's pure seiso. I agree with an above anon, CSC is simply too strong a talent for corpos to know what to do with. She's incompatible with Twitch, and her sheer unadulterated hagness would be such a catastrophic mogging that all the other EN hags would graduate out of shame.