Here's the thing - the US has well-established laws around copyright that don't consider learning from books a violation of those copyrights. This lawsuit is intended to challenge Copilot as a violation of licensing and isn't a litigation of "how people learn." Your program stole my code in violation of my license - there's a clear legal issue here.
I'd pose a question to you - would it be okay for me to copy/paste your code verbatim into my paid product in violation of your license and claim that I'm just using it for "learning"?