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Fact 1) the sisters don't actually care about "cute things" because they are 100% loyal to the corporation. If something "cute" was happening at a different corporation they would ignore it.
Fact 2) women need an emotional connection and a story to fap, unlike men who just need an image. The vtubing format is their ideal "porn" as they can get tepidly invested in the "peronas" and the "characters", and use them in their masturbation fantasies. They don't even pay attention to the personalities, actually they just obsess over the models and use the models in their roleplaying sessions and their fanfics. It's all about masturbation to them.
Fact 3) the sisters don't give a fuck about the livers themselves or if they're mistreated by the corpo. They just want to be tribalists and declare victory over the smallest things. They gang up on everyone who graduates and attacks them. People who genuinely care about their oshi want them to graduate, however the sisters would abandon them since it's not Nijisanji, essentially "trapping" the vtubers in the corporation and a highly abusive and highly unfair situation.