There have been a few times I've had interactions with people on other sites that have been clearly from LLMs. At least one of the times, it turned out to be a non-native English speaker who needed the help to be able to converse with me, and it turned out to be a worthwhile conversation that I don't think would have been possible otherwise. Sometimes the utility of the conversation can outweigh the awkwardness of how it's conveyed.

That can said, I do think it would be better to be up front about this sort of thing, and that means that it's not really suitable for use on a site like HN where it's against the rules.