It’s true that it’s mostly a symbolic act, but the rebellion matters, especially from old accounts. It’s also a nice way to mark the time after which I never participated in SO again. After my ban expires, I’ll deface my questions again. And again. Until they permaban me.
There’s also the possibility of adding to the wonderful irony of making the AI more useful than the original by having content that’s no longer accessible through through the original. It doesn’t get more enshittified than that, even if Prashanth Chandrasekar is too out of touch to ever regret his decision.