Earlier quoted context omitted.
It's likely that Getty have also fraudulently charged many other customers licenses for these photos. It's not inconceivable that each of them could individually sue Getty for their own damages. This looks like it could become a very expensive case of sloppy (or deliberately negligent) copyright overreach.
eh, if they're listed as public domain on the library of congress and Getty got their images there, wouldn't be the library of congress the one committing copyright infringement? Getty is using the license they got the images with, after all.
It is not like they are suing people for republishing a collection or something that could Getty could have created and have copyright in.