That would seem to be a logical implication assuming courts reject claims that "everything on the internet is public domain" or that training an LLM on copyrigh

That would seem to be a logical implication assuming courts reject claims that "everything on the internet is public domain" or that training an LLM on copyrighted material constitutes "fair use" of the copyrighted material. I suspect it would technically be infringement even for MIT licensed code because the original author's copyright notice would presumably be missing.