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People have, for the most part, already settled for girls that aren't particularly amazing at video games. So gaming skill isn't highly rated by companies because it has proven itself "unnecessary." Look at the biggest female Vtubers and ask yourself how good they are at vidya. People have decided they would rather watch cute girls that are mildly retarded struggle at games than genuinely good gamers.
This leads to female Vtubers being hired based on marketable skills like singing, dancing, drawing, ASMR, general charisma(because they have to talk a lot), or just plain preexisting numbers. Gaming skill is almost never a major factor for auditions, and any decent gamers we get tend to be people who just happened to be good rather than people hired specifically because they are. It is an unfortunate situation, considering most Vtubing content is playing games. The only real exception I can think of in the EN corpo scene is Selen. Her art is cute, but I doubt she was hired for that reason and there aren't many other skills she brings to the table.