They're bots, so they didn't know how to read. They're fully operated by a system to post an authentication automatically when new thread on bounties section has been created.

I saw some member still wearing the signature until now, I wonder if there is a participant will take it seriously and create a accusation or PMed Brainboss saying he got cheated/scammed

---

Anyway scam nature in bounty section are based on many factor, even a reputable bounty manager could manage a scam project.