What’s the issue? They didn’t like your licence terms, and rewrote the library under a permissive licence? You don’t have a right to users or an audience.

I agree with that, I never said that was the issue. If you read my message, I answered to:

> but the only thing that protects Free Software (open source) is copyright law

I was merely asking them to elaborate on that, because IMHO, copyright law doesn't protect copyleft licences much (I mentioned people going for or rewriting permissive alternatives, which is now a whole lot easier with LLMs), and copyright is not protecting permissive licences at all.

I have been in companies that distributed hundreds of copyleft and permissive binaries without mentioning them. Copyright says that "in theory, it was illegal". In practice, nobody cares.

I see value in open source, but I don't think that copyright is the only thing protecting it.