I just checked and there's still a sign up wall. It is not as blatant as it was before, but I can't spend more than 10 seconds or click on anything without getting it. Can't even enlarge the picture or visit the original website.

The spammy results problem is super easy to solve from Pinterest's side. Just make pages full of images non-indexable and provide simple pages with one single image and there will be no more spammy results.

By "easy" I mean technically. Pinterest is a scummy company and I doubt they'd lift a finger to make things better for the web and its users.