Here's a shred of evidence for ya:

https://beomniscient.com/blog/the-9-best-llm-seo-agencies-fo...

Oh, I agree that is probably BS right now, but when the bias is hidden in the weights, you’re never going to find it.

Just wait for “$1000/mo for a 10% chance your product is mentioned in the AI summary for an auto parts search”.

C'mon. It is almost like we haven't lived this in everything else (search, social, ...).