It is no wonder why OpenAI had to pay Shutterstock for training on their data and Getty suing Stability AI for training on their watermarked images and using it commercially without permission and actors / actresses filing lawsuits against commercial voice cloners which costs them close to nothing, as those companies either take down the cloned voice offering or shutdown.
These weak arguments from these AI folks sound like excuses justifying a newly found grift.
To avoid IP law causing more damage than it already has with evergreening of medical patents, I think it strictly has to be the generation of substantially similar media that counts as infringement, as the comment you're replying to suggests - not just "this tumor detector was pretrained on a large number of web images before task-specific fine-tuning, so it's illegal because they didn't pay Getty beforehand" if training were to be infringement.