This seems relevant: "No right to relicense this project (github.com/chardet)" https://news.ycombinator.com/item?id=47259177

That's another project though, right? In this case I think it is different because that project just seems stolen. The courts can probably verify this too.

I think the main question is when a rewrite is a clean rewrite, via AI. If it is a clean rewrite they can choose any licence.

No, TFA is about chardet too:

> chardet , a Python character encoding detector used by requests and many others, has sat in that tension for years: as a port of Mozilla’s C++ code it was bound to the LGPL, making it a gray area for corporate users and a headache for its most famous consumer.