>>31266737Because they'd be followed by both antis and previous fans who feel betrayed they left the company.
They play a game without permissions on their new accounts? Tons of reports to the game company to get them copyright-striked
They collab with a man? Both he and the holo will get harassed by unicorns and trolls who pretend to be unicorns to get a pass to harass people
They collab with a famous JP streamer? Tough luck, The big ones' fans hate vtubers with a boner, more harassment
The only big vtuber I've seen graduate and do well on her new account recently is Lulu from Niji, and that's probably because >we don't care about JP nijis and don't know if anything happened on the JP side. Plus, her content is pretty much the same as before. There is also Kaguya Luna, but that story is a bit more complicated