This whole thread really makes me want to pull my hair out.
Difference between illegaly creating a (even temporary) copy of a copyrighted work (e.g. streaming a movie) vs. creating a derivative work of said copyrighted work: Two completely different things, with completely different legal outcomes.
If OpenAI in any shape or form creates a temporary copy (<--- by copyright definition of what a copy is!) than this needs to be adressed with the former. If OpenAI creates a work that is considered to be a derivative work (<---- by copyright definition of what a derivative work is!) than that needs to be adressed with the latter.
The crux of this whole thing is: Human minds cannot make a copy of a copyrighted work by definition of copyright laws (in Germany, I presume the same can be said for pretty much all western copyright laws), while anything that a computer does can be construed as making a copy.