Agreed, I am very skeptical too. I have a long time believed that dynamic linking vs running an executable with arguments will be regarded the same in a court.

Agreed, I am very skeptical too. I have a long time believed that dynamic linking vs running an executable with arguments will be regarded the same in a court. So either both are derivative works or neither. My personal belief is that a court will only care about if your code is a wrapper (e.g, libgpg) or if it is its independently useful and just uses the library (e.g. PostgreSQL using libreadline) for a small part of its operation. But I am not a lawyer and this has not been tested in court as far as I know.