Is this really surprising though? Wasn't ChatGPT trained on much of the same thing social media creators create content
from?

In other words, they have the same precursor source, at least in part.

And, they're programmed to be agreeable to some extent.

And, given that another input for AI is human contributors who are basically going to teach it to do the same thing those content creators do, by which I mean comment on non-peer reviewed articles without nuance or critical thinking, etc.; it seems inevitable me that AI would mimic the echo chambers of social media soon enough. They're mimics of us, after all, not creators of content and not thinkers.

I can't wait for the first flame war between two of them. Have you got your popcorn ready?