Sayu in VShojo when?
EDIT: Say what you will about VShojo, but their entire business model has been on point lately - make Hololive/Nijisanji work out the kinks of the talents + advertise for them, them poach them once they are more comfortable doing the whole Vtubing thing (add points for dedicated fans wanting to support them after they leave) for half the cost and none of the baggage
Cynically, you're right. And if it's working for them then they don't really have any incentive to change.
But is it a good long-term strategy to be seen as the "retirement home" agency? Is there going to be a point where they're going to have a harder time getting new talents because they have this image of being the agency for has-beens and failures? In my opinion it would be a good idea for them to still be bringing in fresh new talents to avoid that. But I also don't expect them to actually do that.