This isn't legal advice, but when you do something illegal, it's best not to do it in a semi-public forum that is tracked by your employer and would be an obvious place for law enforcement to look. Everyone who uses a Bloomberg terminal knows that their employer's legal department can and will look at logs of their conversations. Does insider trading happen there? Probably... people do stupid stuff all the time when it comes to insider trading, such as using their work emails. But it's definitely not the core value of a terminal for anyone.