The GPL doesn't work like that. You can't withdraw the license from code you've already shared.

Non-story.

I fully support morally all contributors who would want to rescind. I don't have any format contribution inside the Linux kernel, but if I had, I would rescind on principle, for having a CoC.

Any project that needs to have a CoC to enforce civil behavior (and strong language is not out of civil behavior IMO) isn't worth contributing with.

There are already too many laws in civilized countries, we don't need to add such layers.