Well there's a difference between "don't look at my work without paying me, even if it's posted publicly" and "don't sell my work without paying me, even if it's posted publicly"

Like I said, there's nothing we can do about companies using all the data they can get their hands on for private R&D. It IS possible to protect against the second case, where companies can't sell an LLM product with copyrighted training data.

My question was about how that second case could be extended to stuff posted on the Fediverse, such as if an instance had a blanket "all rights belong to the user posting the content".

These laws exist, if companies can use them then so can we