I think this will be a kick in the teeth for Pinterest in the EU. I have always thought that they overstepped the mark because instead of always just hyper-linking to pages and images they re-publish on their own servers. This ensures that the image doesn't disappear from the users pinned images feed. Since Pinterest also allows sharing of those images that is in effect a publication.
At the moment it's pretty much impossible to find out if Pinterest is hosting any of my images without consent, without signing up for an account myself, something I really don't want to do. I just don't want to add even one to their user count.
This along with the new data protection rules look to give one a good way to force Pinterest to check and remove all of my "personal" data and copyright material from their servers.
Alan