I doubt people would work for a chat bot in order to just claim rains but if they could somehow manage to make that work, that would be something special not because it could earn money but we are talking about a bot that would write down some words you have coded into it and not get caught. What could you write and say that wouldn't attract any suspicion?

Think about it, if all real humans stopped and only bots left we would see totally unrelated words and sentences all post there making absolutely zero sense. That is why I think it is close to impossible not because of coding sense, I don't know coding so I can't speak about that, but it is impossible about the making sense part, not getting caught part, I doubt that anyone would be capable of not getting caught with something like that.