>>31977495V-Sen is unironically the best "VTuber School" structure in the industry right now.
Rurinee and an indie artist are running it independently with minimal overhead and getting completely inexperienced people (with passion) into their ranks and giving them training, while also allowing them to join any of the big corpos if they make it.
VTA, despite professing the same "you can join anywhere" attitude, won't actually let their talented graduates out of Nijisanji. Social pressure and the talents' youth will allow them to be easily manipulated, and VTA basically just becomes an "Entertainment Factory" for Nijisanji.
Also VTA used to be similar to V-Sen, in that it would accept complete newbies to streaming as well, but now they've done away with that requirement. So ironically only experienced people can get accepted into this "school for VTubers".