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I think that when it comes to "stretching viewers" there is two types of stretching. Latitudinal stretching, and longitudinal stretching.
Latitudinal stretching is when multiple people stream at once, splitting the viewers between them. Everyone knows overlaps kill viewers.
But Longitudinal stretching is different. The viewers basically have a set amount of time they can watch vtubers every day, and they choose the streams to watch. So streaming in the morning actually can steal viewers from streams in the evening. There's only a fixed number of "content hours per day" every viewer has.
So even if they're streaming at different hours, vtubers can steal viewers from each other. Acceleration stretches everyone.