Results are often filled with low-effort, low-value content designed primarily for advertising. Listicles, recipes that would be 20 pages if printed and each page containing ads, content that’s just copied from some other site with more ads added, etc. I think Google could fix or alleviate these issues, but they choose not to because a lot of the ads are probably being served by Google’s own ad network. Kagi, for instance, alleviates some of these issues with an obviously much smaller budget than Google.