This is just not true. The pics are owned. They do Not have to be marked. They are not public property to use as pleased, they are viewable. If a pic owner wants it removed they need to be removed. Period. If not websites can be punished even shut down. It's Copywrite infringement.
I understand your frustrations P&P, unfortunately once you post on a public forum, that becomes open to everyone on the Interweb. However morally wrong it is, unless your info and pics were private, there is nothing you can do. I would be happy that a breeder thought your chicken was a good example of the breed... Kudo's to you for raising a healthy guy!