I’m plenty open to questioning every part of copyright (has the idea ever actually been proven to be worth the enormous costs? It’s like an infinity-percent tariff on anything information related.) but the same copyright should apply to everbody. It sounds like this proposal gives a specific pass to corporations developing AI - anything these corporations can access should be accessible to the general public as well. If you can use a song to train an AI for free, a human artist should also be allowed to use it directly and turn it into a new work.