The point of answering questions in public spaces is the public, not the person (or LLM) posing one?

While faking human interaction possibly should be prohibited outright, one cannot ever be sure that is being adhered to? And humans can be disingenuous as well to begin with.

It's how you engage in a discussion and conduct yourself that matters, because other people are there witnessing it.

Now, when that LLM fakes human sentiment and you or others fall for it, that is a problem beyond the use of LLMs? The same would be true with sock puppets operated by real people, only the scale differs.

When you solve that problem, by putting high value on the factual and logical truth of statements for instance, you solve multiple problems at once.