On a currently active topic (which I won't link to here for now), the OP's original post and their every subsequent reply is very obviously written by AI. I put the text of the first post of the thread into an AI detector (zerogpt.com) and it says 100% AI, plus it's easy to can recognise the style after a while.
I have reported it and I'm interested to see what MNHQ do about it. The discussions are respectful, just weird. It's a topic asking for info, so most replies are from people who will probably just read the first post, reply, maybe look at the friendly (AI-generated) response, and not notice the pattern.
I guessed that it might be a non-native speaker, but then there are automated translation apps for that so that people can type what they want to actually say in their own language. As it is I don't know if OP is a human copy/pasting AI text, or a bot doing it all autonomously.
There is nothing that I can see in the Talk Guidelines about using your own voice. Using AI just seems disrespectful, but also, I am more concerned that there may be some "harvesting" ("scraping") of the site going on. (Again, I have reported that concern to MNHQ.)