Now I'm gonna counter that argument: how much of it is acting?
I know some chuubas that are completely into the character, but there's a degree of characterization that streamers ignore or just get tired of, stop larping and wear the L2D/3D model as their own skin, becoming their own with a new shade of paint. This happens everywhere, we talk a lot about "dropping the act" during BraveHoloSanji debuts because that shit is insufferable.
The only cases of proper characterization from the top of my head are Fuwamoco (Holo), Salome (Niji) and let's say Fillian (indie) for the sake of completionism. They do not bring their personal life as a topic in a form you could relate to or build a profile over it, this is very clear in Fillian's case that you can see her numberfagging streams in her alt, she sounds like another person completely.
If you're on character most of the time, sure, become that character, show the world the character and destroy your ego, but that's a huge cross that many women do not want to carry: it's a responsibility and a burden before your audience that expects you to keep that up, and if you can't keep that up, it's better to not say anything, ever. That's how you slip and that's how simps become antis.