Less simple answer: Pinterest has 335 million active users for a reason. It's where people go to collect fantasy boyfriends from TV and movies (not a dig, it's a valid hobby), plan weddings, and generally anything where collecting images from around the web is useful. It's Pinboard for a completely different realm of niches from what you're familiar with.
Pinterest ranks because those results are useful for more people than they annoy.
I understand the premise of pinterest, and have actually used it as a design board in the past.
My point is that as an image search result it is user hostile bullshit that frustrated me enough to stop using Google search as a daily tool.
You can talk about how I'm not the target all day, but that doesn't change the fact that it is an inferior user experience enabled by Google.
They're not easily found because they come after 4 pages of Pinterest results in image search.
Perhaps it should be possible to downvote search results to further create a better personalized effect — continually downvoting Pinterest should have a desired effect.
On google images one can type -pinterest
This explains a lot.
How is this valid? Seems like an awfully silly waste of time.