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NijiEN are the only ones (between Holos and them) to consistently stream during NA prime time. Gura's multi-day breaks and Ame's constant postponing has opened a window of opportunity for NA VTuber fans to watch other streamers like Nijisanji, PRISM, and such.
Naturally, when Holo Gen2 debut everyone else will take a small hit since trend followers will jump to the FOTM VTubers, but for Nijis to be killed, Holos need to have good content, likeable personalities, and compete with the Niji's time slots.