University of Zurich researchers secretly unleashed an army of manipulative chatbots on the r/changemyview subreddit — and they were more persuasive than humans at getting people to change their minds.

In recent months, a group of researchers conducted a secret experiment on Reddit to see how artificial intelligence can be used to influence human opinion.

The platform’s chief legal officer called out the University of Zurich team that deployed bots on r/changemyview to study how AI can influence opinions.