So a vtuber agency can prevent you from streaming, thereby depriving you of income. But they can also prevent you from working anywhere else either, even though you're an "independent contractor".
So they can essentially starve you from all income entirely if you get on their bad side, and they use as a bludgeon to compel talents to lick their feet at all times.

Because you're an "independent contractor" they can avoid paying you a minimum wage, healthcare coverage, or any other benefit. While at the same time forcing you to attend meetings and meet monthly minimums just like a regular employee. Oh and they own everything you ever produced, even a song produced with your own money and labor.
This contract looks REALLY dark once you take away the aspect of "earning millions of dollars" which seems to be how it's justified.