Surprise! Never seen this before... from a website without a nopin tag.
If your artwork/photography is on a domain name that you own, you can notify Pinterest that you want them to block your website from pinning.
They have the technical ability to this, for they have done it. It did take months of screaming to get there.
No more endless recoding of ineffective nopin tags. While that does make things quite a bit easier for webmasters to manage, we're still dealing with an arrogant opt-out, rather than opt-in. It does beat thousands of take down notices.
What the message is missing is (1) an admonition to only pin their own images or images with a Pin-It button or (2) a link to a page on Pinterest explaining their users how to find images from the Creative Commons.