Whether you agree with them or not the free software / copyleft advocates mean something very different from what Carmack is getting at and always have before or after AI. It has always been an anti-corporate position and it's not difficult to reconcile in my mind at all?
That said, I'm personally a free software advocate, and in favour of the GPL as a license but I use "AI" (LLMs) (critically). To help make [A]GPL software. I kinda feel by copylefting the output, in some sense I'm helping to right the wrong.