Unless some troubling news leaks, I think the Aqua situation is as simple as a genuine creative difference like she has stated already. Hololive isn't the same company it was years ago. It's exploded in size and world wide popularity and with that new popularity and size comes more rules and regulations to protect the company and the talents. That can be stiffling and feel overly protective at times, and clearly Aqua want's more freedom to do what she wants. Other girls have talked about the same feeling, with Marine coming to mind. Absolutely nothing wrong with feeling the way they do either. There really doesn't seem (at first glance at least) to be anything else behind this other than she feels "Aqua" has run her course so it's time to move on and hang up the maid outfit. She'll be missed and remembered but at the end of the day the real up side to this is she wasn't fired and is going out on her own terms. If she chooses to stream somewhere else she will instantly get her fans back.