Let them do it. It will end up really well. I know the system has been protecting these companies, but that has been an economic concern as much as other motives. Now that AI is the crown jewel of economy and global dominance, let the entertainment industry have a go at it. Let them.

Do companies in the US really have the right to do that? I would think that kind of investigation is reserved for law enforcement only. If the design was made over email, would the piano company be able to subpoena Google for someone's private gmail messages?

Maybe then using an open weights model is a good way to hide your tracks...