It's hard to tell how many of Idol's issues and graduations are fallout from their biggest problems (eg. Riro Ron termination, Toma firing, Aviel falling for Slugma's transparency meme, etc), and how many are just mismanagement overall.
But the good companies have always been examples that prove that worse companies exist, and I don't think Phase and Hololive are just lucky. If Pochi was willing to set her career on fire to get in a few shots and Yuko ghosts except for her donothon rewards, three times is a pattern, and I expect problems like these to keep happening.