I think some people aren't really seeing the forest due to the trees rn with Chita. Her entire thing is that she doesn't know how to mature or grow up. She doesn't want to mature or grow up. I think I made a comment on the last chapter where this happened or on the last couple of chapters this happened, IIRC when she dragged Toyoda's brother around tailing them and getting annoyed about his sister getting asked out by Inuyama. It was on a different topic than what it is now, but main point is the same, she doesn't want to get left behind as she continues to try and stop the world from marching onwards before she thinks she's ready. In this case, she wants to make it so that way if they become famous on YouTube, they'll have no other choice but to stick with her and leave their boyfriends behind for success with her. It's immature and annoying but that's because it's supposed to be. She doesn't care if it's actually going to work or not, if it keeps the three of them together for just a bit longer and she's the most important part of their lives, it's worth whatever annoyance or embarrassment she inflicts on them.