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Really it's just a further extension of how mad Nijinigs were at ex AKB idols and ex idol plus ex kintate youtbers auditioning for Hololive instead of them.
They'd try and drum up anything because they already decided they hate them from the get go.
They just pounced on Riona's moment of weakness but don't think they aren't waiting for Vivi or even Niko to do the same