Personally I loathe seeing Pinterest come up in my Google searches. So I use a "custom" search in chrome that just sticks "-inurl:pinterest" after all my searches. Perhaps that may be an option for you.
Yes, all these bullshit sites, where right click and saving images, videos etc. doesn't work, because they want to monopolize the actual media content, fuck them.
Because most pictures are reposts which distracts you from the actual image source you are looking for (Sometimes you want the original text that was next to the picture).
Also, since there are a lot of other pictures with titles in pinterest pages, the probability to match all keywords in your search is high even if the relevance of the main picture is low.