At least before the answers would benefit the whole community, fulfilling the spirit of CC licensing. Once it's fed to a LLM, it's essentially a form of laundering, as it's dubious the output of the models will also be free under CC. The "open" in OpenAI is effectively fake advertising. It's a proprietary enterprise misleading people by pretending open something.
It still does tho. I don't see why "whole community" cannot include open-ai? I mean, I've used knowledge gleaned from SO for the benefit of many large corporations who employed me in the past, that's not new.
"The Whole community" and open-ai are not mutually exclusive, despite what you may feel about it.