Viruses are the OG nanobots. Not only do they look robot-y, they also technically don't count as living IIRC
There is actually a large controversy where one half of people who care think they are non living and the other half of people who care think they _are_ living.
Life, like free will, is just one of those words that mean less and less the closer you look. Whether they are alive or not doesn't matter.