To me, the valuable comments are the ones that share the writer's expertise and experiences (as opposed to opinions and hypothesizing) or the ones that ask interesting questions. LLMs have no experience and no real expertise, and nobody seems to be posting "I asked an LLM for questions and it said...". Thus, LLM-written comments (whether of the form "I asked ChatGPT..." or not) have no value to me.

I'm not sure a full ban is possible, but LLM-written comments should at least be strongly discouraged.