I remember corresponding with a TSR lawyer in the mid-90s. At the time I was writing my PhD on copyright, these days I'm a UK senior lecturer (US - Professor) teaching IP law, including copyright. I remember being struck by how this TSR lawyer had only the vaguest idea about what US copyright law actually said. They barely seemed to know the difference between copyright and trademarks.
You're assuming ignorance here when you may have been encountering an employee expressing the corporate marching orders. It's entirely possible the lawyers knew the difference, but the aggressive stance the company management was taking on copyright and trademark required them to avoid clarity in public statements, because that might undermine the aggressive public policy.
Cheers,
James Lowder