I think the law should address multiple things, only one of which is the outputs of learning. For example, if both the copycat human and the original director human both watched the movie via stealing it, that's also bad. Especially because copycat human is then going on to create copies of work they never had legal permission to copy! CoPilot effectively cannot tell the difference between an homage and theft.
It should be illegal to reproduce copyrighted material, but not to “read”, “view”, or “consume” it.
Luckily this is what the law already says.