I don’t care, they are a blight on the internet that deserves to end. I have NEVER wanted to see a Pinterest board in my Google search results image or otherwise and their SEO optimisation serves only to parasitically drive traffic in order to feed their conversion funnel.
If your Pinterest board is public and you let others see it that’s nice, but the Pinterest developers should never have let that show up in my search results, your board is not and will never be more interesting than the original content you have pinned from other places on the internet, shitty aggregate pin pages hurt original content producers by ranking better and stealing page views and preventing users from navigating to the original content without jumping through hoops in the Pinterest user interface.
I can’t think of any reason why a spam Pinterest link has any value, yet it’s ranked high.