Earlier quoted context omitted.
https://arxiv.org/pdf/1912.04206.pdf
> Even though the environment of r/unpopularopinion encourages users to freely express their opinion, the dominant population of this community is young white males, and only the opinions representing them are supported by general users and brought up to the front page. Consequently, the minority opinions are neglected and it results in another spiral of silence phenomenon in the community I don’t know if young white…
Regardless, I agree with you, the groupthink is the issue here - I do think it is telling though, that it is a groupthink (allegedly) skewed by the white male perspective. Which I think is also an issue, lack of representation in such echo chambers. But you’re right - two separate issues that happened to be intertwined here. Anti-racist echo chambers are still echo chambers.