That's the opposite of what I was hearing recently when I listened to the episode of Techmeme Ride Home podcast where they interviewed Arvin Srinivas, CEO of Perplexity AI which is one of the bigger AI players out there right now. He specifically said from their analysis, it seems that Yelp has More accurate reviews as they on average score lower than their Google counterpart, which has been suffering from a ton of botting recently, so it seems like they were balancing their AI towards Yelp data.
You may be correct in that Yelp sold out at some point, but it seems like Google is even worse now, lol. Basically they both probably suck.
I think we need some kind of blockchain ID system, maybe like Worldcoin (although I have my own problems with that, primarily Sam Altman) that can prevent a lot of these bots from occurring. You still run the risk of users being paid off for reviews, but at least it makes it more costly and difficult to manage human meatbags.