Because the Pinterest I keep for reference art is at probably ~900 unique images? And I feel like sharing them because not everyone is willing to take the plunge into making Pinterest work (and I can’t blame them, the site does a terrible job of being usable imo)
I had hundreds of saved pins and they decided to suspend my account with no warning or notification because of some image that was already on their system! Then of course customer support has been utterly silent to any requests of recovering.
I don’t think they block individual save image as… but they make it really difficult to backup and download your albums. Their APIs or whatever only give you link to their pages, not the image nor the original source.