I understand what you are saying, but there are different kinds of learning. If your model learns how many fingers are on a hand, it does not violate copyright in that regard. Every copyrighted work relies on facts, abstractions and styles they don't own. Models don't have the necessary capacity to remember exact expression from each source, only generalities are being learned and later recombined. Blocking AI from training on grounds of copyright is a maximalist take on what copyright protects.

Let's say we change copyright to cover abstractions, then any human creator would be in deep trouble. Incidental similarities would make the creative act too risky.