There is a massive difference between saying "I use AI" and what the author of this bot is doing. I personally talk very little about the topic because I have seen some pretty extreme responses.

Some people may want to publicly state "I use AI!" or whatever. It should be unsurprising that some people do not want to be open about it.

The more straightforward explanation for the original OP's question is that they realized what they were doing was reckless and given enough time was likely to blow up in their face.

They didn't hide because of a vague fear of being associated with AI generally (which there is no shortage of currently online), but to this specific, irresponsible manifestation of AI they imposed on an unwilling audience as an experiment.