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CCV is a metric that benefits hololive, because hololive talents typically stream in isolation. That is, not overlapping. That's because there's so few hololive talents, and they stream so little, overlaps are not a thing.
But in NijiEN, you have 26 talents. And each one of them streams 2-3x more than the average hololive talent. A Hololive talent will stream 10-15 hours a week. A Nijisanji talent will stream 20-40 hours a week.
So Nijisanji has lots of overlaps. In this case, she was streaming against 10 other people. That's just how it is. You have lots of choices for what to watch in Nijisanji.