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Niji cuts the other way. Not only do they get a lower percentage of the total, but any expenses comes out of their own pocket.
So basically if you have 600 viewers in Idol, it's the same revenue as having 1k viewers in Nijisanji revenue-wise.
This is important because the female vtubers of NijiEN are not doing well, and several of them are getting like 500 viewers or even less. Under those circumstances joining Idol is a better bet.