What does it mean when a vtuber formally graduates from a corpo, saying that they want to pursue other things in life, just to debut as an indie within a week?
What does it mean when multiple vtubers from the same corpo do that?
Personally, I think whatever the answer is will be far from "because the corpo treated them well".
Anyway, Suzuya Aki, graduate of Nijisanji JP on 31st August, debuts tomorrow as Izuho Omi.
Graduation is a term for retirement/stepping down from a given group, stemming from a high school themes idol group, where members often stepped down, because they felt they were too old to be high schoolers, and called such a graduation.
If multiple members file for the right to formally step down from their role, it is often the case that they consider it feasible enough to walk away, and return to their independent roles, confident that their most passionate supporters will find them, in time, as has been the case with Dokibird, Mint Fantome, and others