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Tempus were never intended to be "brotubers", they were meant to be regular female-targeting male vtubers. As such there were no plans to do a lot of collabs with the girls because their audiences wouldn't overlap anyway. But after their initial reveal and people making MAGGED memes and throwing the idea of brotubers around, Cover management decided to change directions to try to capitalize on this concept, because they figured they'd never beat Luxiem at their own game anyway. This new direction meant that they now needed to do a lot of collabs with the girls in order to try to funnel their male audience into the boys.
tldr: MAGGED memesters are responsible for the current drama.