Earlier quoted context omitted.
"Everyone of these results requires a signup and log into Pinterest to be able to see it" is a problem.
It's a bit more than that. (Or all newspapers behind a paywall would be blocked). The problem is that, even with a logged in Pinterest account, clicking on a Google image search result doesn't take you to the image. Sometimes the image will be on the page, but not always. Sometimes have to perform another search on Pinterest to find the item. Here's an example where the image is below the fold. There are plenty where…
I was under the impression that the current X-Articles-Free implementation of newspaper paywalls everywhere was a Google-friendly compromise.