Don't forget that organic bacteria/virii/fungus can also be extremely deadly. Even artificial ones. But yes, it'd be more like biological threat than "grey goo

Don't forget that organic bacteria/virii/fungus can also be extremely deadly. Even artificial ones. But yes, it'd be more like biological threat than "grey goo scenario". What if they "eat" electronic devices and other human artifacts instead of organic compounds? Would that contain enough "exotics"? It wouldn't be as directly deadly as nanobots eating meat, but could do great harm to our civilization.