Apparently Gura, the shark Vtuber, sang at a baseball game. The cuteness was so extreme that the team that was playing at home started winning and the other team started stumbling despite being well up in the score.
So that means her singing gave a buff to her team, like some kind of bard. Impressive.
All the boomers probably loved her for the rallying effect she had on their team.
No Game No Life was right: you should fight for cuteness.