You're right that nobody wants to hear it, but I think that's because nobody wants to find out over and over and over that every thread is AI generated. Not because when something is AI generated, they wouldn't like a heads up so they can find something else.

For example, I've had people thanking me for pointing out LLMish later in an article when it's not as obvious at the beginning. It saves the time of thinking the article is manually written when it'll later turn out to be AI instead.

Note that I don't necessarily have anything against AI in particular, but rather the chronic lack of information density typical of LLM-generated articles. Some articles that were LLM-assisted are still information-dense enough to keep me satisfied.