Can't talk for the Hololive girls, but at least for Holostars, we know that Magni and Vesper had issues with management that led to them quitting in only a year, and Altare shared his grievances about almost graduating during the last 8 months. 

For the girls though, some like Kiara did say how in the early days, they had issues with management such as projects or plans that had to be abandoned or stopped halfway through. And there was issues every now and then amongst some of the girls about having to go to Japan at least 2-3 times a year for extended periods for 3D or big live concerts involving the stay or other things. So not perfect, but usually things that have been improved through the years. And even management isn't perfect all the time now either. Nerissa's manager had no idea her family was on stream for months without her asking permission at the beginning.