I presume it's using sites like facecheck.id which have an index on all social media, and provide a reverse face search into that index. This means even people

I presume it's using sites like facecheck.id which have an index on all social media, and provide a reverse face search into that index. This means even people who change their FB name to something random, for privacy reasons, can be found. So no, I'd say the victims are not doxxing themselves.