Jacob. Slightly better known by his middle name - Yuri 
Yes and the first suspicion for me was also partner site, but just dropping in for a minute or less, I saw a flock of Yuri's images and knew that it was stolen content.
Maybe Yuri is big enough to take these people on?
I know that as an individual, any time I go to complain, there's the stonewalling and "only the artist can file a DMCA notice". Well lovely, except that's it's US Copyright Law and who in the rest of the world, where so many countries don't care and don't enforce, is going to do anything about a claim from an artist?
For people who are unhappy with low pay, subscriptions or free sites, this is much worse, as it's plain theft that we can't stop.