Yes, they are related to nanobots. Might could be people should put more effort into developing ethics. But microrobots aren't as powerful as nanobots; they're big and clunky.
At this scale, variable modular robots tend to be more powerful. Frex, Cubelets are blocks that perform a function. Stick them together to make robots. Think of these like organs in a body. Because they can do different things, they are useful; because they can be connected in many ways, they are versatile.