Then please explain how pirating movies or games doesn’t cause harm to other people but training AI with the copyrighted work of others does.
In both cases you’re taking something for free that you’re expected to pay for. In both cases there’s someone not getting paid. The only difference between the two that I can see is the scale which is irrelevant from the point of view of the argument I’m making which is that it’s hypocritical to be against one but not the other.