Google has commercialized a huge amount of search terms. I'll use biology as an example. You search for particular species and search results prioritize products that kill the species. You search for a particular plant and you'll have a hard time learning about the species as it only shows cultivated versions and products related to how to care for them.
Pure information/knowledge for the sake of learning and curiosity is de-prioritized.
Back to image search, it's unable to figure out original sources or doesn't care. Pinterest is the well known manifestation of that.
Google shopping results: completely broken. Click through on the products and half the time the price, availability, discounts and stock do not match.
Everything is so goddamn broken, and nobody at Google seems to care. I can't explain it, but it's been going on for a good 6-7 years or so.