Not only do most people copy each other's ideas, but most WordPress websites these days are not custom made, they are WordPress themes that anyone could download either for free or for pretty cheap. Most people who build Wordpress websites these days are not professional developers nor are they professional designers, they are just ordinary Joes like you and me.
Even professional designers and developers get their ideas from other sites they see on a daily basis.
Most people these days don't just come up with a concept for a website and the entire design on themselves.
