I don't think they'd meet the requirements to be covered by the DMCA safe harbor, i.e., being unaware of the infringing material and not receiving financial ben

I don't think they'd meet the requirements to be covered by the DMCA safe harbor, i.e., being unaware of the infringing material and not receiving financial benefit. However, they may be able to try a "fair use" defence, since they aren't republishing the photos.