Well, Dizzy has complained nearly every other stream about not being able to find a boyfriend, and that her friends have suggested FFXIV as a way to find a boyfriend (but that it would also ruin her life), and she's only ever been propositioned by women. If she was into women, she and Ember would have been together already, they're a package deal at this point. If you want to get on Dizzy's good side, you have to have Ember and her family's approval.
As for this game, I feel like it's only popular because it's popular - big streamers played it, causing other streamers to play it, and when people see their favorite VTubers play it, they play it as well, including the small/indie VTubers, it's literally FOTM and there are better horror games that deserve to be played that little-to-no other VTubers have played - such as Song of Horror:
Also, holy shit, that scream