They explain that without it, they can't effectively enforce the copyrights on their projects: https://www.gnu.org/licenses/why-assign.html.en https://www.gnu.

They explain that without it, they can't effectively enforce the copyrights on their projects: https://www.gnu.org/licenses/why-assign.html.en https://www.gnu.org/licenses/why-assign.html.en I highly doubt that the FSF, who developed the GPL licenses and values free software above anything else, would change the licensing of their projects like "these companies" do.