They are in the fact that children and adults will not be running through their coop or run, getting poop on their shoes then potentially tracking that into a house. And commercially raised chickens don't get kissed upon like backyard chicken pets. They might be pets to some people, but they could still carry bacteria that can sicken someoneYes, they are nothing really new, but I find it a bit concerning that they say the specific words backyard chickens, as if commercially raised eggs and chickens are somehow much safer.