Copyright law does not prevent learning from copyrighted material. There is no potential infringement for fair use to be applied to. Nothing is being copied and shared.
If they're suing, they're doing it because they think they can manipulate a ruling that does not in any way follow the law and because the benefit if they can do so is huge, not because any intelligent rational human being can read the law and possibly interpret anything as infringement. It's not ambiguous in any way. There can't be infringement if you don't distribute someone else's work.