AI Experiment Sparks Ethical Outcry on Reddit, UZH Faces Scrutiny Over Unauthorized Study
April 28, 2025
Researchers utilized AI-generated comments, including posts claiming to be from trauma victims and using fabricated identities, raising significant ethical concerns.
The study aimed to assess the persuasive capabilities of large language models (LLMs) in changing people's perspectives during civil discussions.
As concerns about authenticity in online discourse grow, some users are migrating to group chats and forums that offer better identity verification.
In response to the ethical breach, there have been calls for more stringent ethical standards in research to prevent similar incidents in the future.
Ben Lee, Reddit’s Chief Legal Officer, condemned the project as morally and legally wrong, confirming that all related accounts have been banned and that legal action is being considered.
Moderators of the subreddit have kept the AI-generated comments visible for transparency and provided contact information for the UZH Ombudsperson for reporting concerns.
This incident has sparked broader concerns regarding the integrity of online discourse and the potential for AI to manipulate community interactions without users' awareness.
The University of Zurich acknowledged the need for a stricter review process in future experiments and stated that an investigation is currently underway.
The subreddit, known for its civil discussions and debate on controversial opinions, has strict rules against AI-generated content, emphasizing the community's value for human interaction.
The recent controversy centers around an unauthorized experiment conducted by researchers from the University of Zurich on Reddit's r/ChangeMyView subreddit, which has approximately 3.8 million members.
Findings from the draft study revealed that AI bots achieved persuasion rates three to six times higher than human users, prompting fears about their potential influence on public opinion.
Moderators rejected the researchers' justification, asserting that previous studies had been conducted ethically without involving non-consenting human subjects.
Summary based on 22 sources
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Sources

The Verge • Apr 29, 2025
Reddit bans researchers who used AI bots to manipulate commenters
Mashable • Apr 28, 2025
Anonymous researchers used AI bots to experiment on a Reddit debate subreddit