I had a +200 bounty question set to expire in 2 hours when I got an answer to it. I suspected the answer of being written by ChatGPT based on the format, and material of the answer. The answer did not actually quite answer the question, but sounded exactly like how chatGPT might respond to the question. I posted a comment, asking about some of the detail of their answer, but also asking "Was this written by gpt or any other ai?". Soon after this, the OP deleted their answer.
I was wondering if there is a trend of bots posting chatGPT answers to questions with a bounty that is soon to expire. Motive being that a single person or organization could control dozens of separate high-rating accounts on math stackexchange for conspiracy purposes, since the answers being posted are not written by humans but rather ai bots.