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Vtubers are adults and can decide for themselves, respect what they do. They have complete agency over what they want to do, it's not your place to beg for them to change.
Unless they don't want to collab with guys, then they have no agency whatsoever and are just damsels in distress who need to be rescued from their evil toxic parasocial incel fans who are putting guns against their heads and keeping her from doing what she obviously wants to do like any other woman.