I don't personally use AI/LLMs for any informal writing here or on reddit, etc. But I think it is pretty weird to be overly concerned around people, particularly ESL, who use tools to clean up their writing. The only thing I really care about is when someone posts LLM regurgitated information on topics they personally don't know anything about. If the information is coming from the human but the style and tone is being tweaked by a machine to make it more acceptable/receptive and fix the bugs in it, then I don't understand why you're telling me I need to care and gatekeeping it. It also is unlikely to be very detectable, and this thread seems to only serve a performative use for people to get offended about it.