>What if I read the code, understand its concepts, and re-implements another library that provide similar functionality without directly linking to the original

>What if I read the code, understand its concepts, and re-implements another library that provide similar functionality without directly linking to the original repository, that is not an infringement I agree, that's fine. The analogous situation with image generators would be if the companies that trained the models had a human artist look at every image in their dataset, paint a unique but similar image, and then feed all of those images into the model, so that no copyrighted images were used in training without permission. But that's obviously not what they did. They just fed in the images unaltered, without getting permission.