Are pitot systems protected from ice? Aircraft use pitot tubes or pitot-static tubes. Do these have some kind of anti-ice system? If so, how? And if not, why not?
I'll just point out that it doesn't seem trivial to de-ice such a thing. A simple heating element at the front would melt the ice but then the water will travel through the tube and probably quickly reform somewhere else. So the entire tube could be heated, but then, that will drastically alter the ambient conditions that the pitot is trying to measure.
You can see an example sketch of a heated pitot tube in the FAA Handbook of Aeronautical Knowledge:

As you can see, there are two heaters that heat the entire tube and (ideally) stop ice from forming in the first place (anti-ice, not de-ice).