Well, sounds like you're well on your way to hand-rolling your own product comparison tool that's Powered By AI TM. You could make a popular price comparison site that initially filters out all that cruft and just gives you simple, clear, easy to read information about products.

Version 2 could have handy links to the cheapest websites.

Once it gets super popular you could offer retailers the chance to ensure their products and prices are correct. Perhaps a nice easy AI powered upload where you dump the info on whatever format you like, check it's understood and go live.

You could later offer retailers the chance to host a store front with you, or maybe allow initially just one or two, very tasteful, clearly marked-as-advertisment links for strictly AI-sanctioned relevant upselling, you know, offer the warranty with the product, or the printer with the fancier ink alongside the ones that exactly matched the criteria.

Once your engagement with retailers is strong, and they know they'll be missing out on a lot of custom, you can start maximising your income from them.

Or, wait did this whole cycle repeat itself many times over with many websites and many corporations?

Enshitification is real, and it's already AI powered. We don't know exactly why what's in front of us when we're online is the thing that is most likely to get us to keep scrolling and clicking and purchasing and maximising profits, but it's reasonable to assume that on a lot of successful websites, some sort of AI system chose it for exactly those purposes.

It's nice that you feel AI will get us away from the power of the multinational corporations, but I think it's vastly more likely that the AI we use will fall under their control and they will be twenty steps ahead of us. They were the ones who popularised it in the first place!

(Personally, I tend to use some reviewing sites that I trust and in particular for phones, a spec agreggator so I can filter out the five year old products that amazon is offering me.)