So, still ads but different name. These price engines (every one I've seen) are all affiliate hubs; they list only products that pay for the click. Any reviews on such sites are biased in similar ways to the gaming in reviews in major sites like Amazon.
Now, one could say, "so what? Most folks know that, useful info still, and it's better than ads!". But is it? At least the ad is an overt block of color, but affiliate links are hidden behind redirects and tiny disclaimers (in the few regions that require disclosure).
It's fine (and easy) to complain about display ads or video ads, but there's a lot more. Product brand shown or mentioned in tv or movie:ad. Movie trailers: yep, ad. Public media mentioning a sponsor: ad. That tiktok or insta person who always has branded product in the frame? ad.
In fact, most product discovery comes from ads. Is there another way? Probably, but ads have worked better than any other approach for so long, we haven't beaten it yet. I hope we do, but til then, for every 100 ads I despise, I'm still happy I found that one thing I actually liked. Can't say that defends all ads, but it gives me hope that we can find a good middle spot.