What ends up happening with the idea of building the windmill? Again what does this tells us about the type of leader Napoleon/Stalin was?

Over the years, the animals will work tirelessly to build the windmill, sacrificing everything from their rest days to their rations in order that it might be completed. In the same way, Soviet citizens labored for an abstract “common good,” the fruits of which they never saw. Each time the windmill is destroyed, Napoleon gives the animals new hope that, next time around, they will build it and reap its benefits. In the same way, Stalin kept the Soviet people trained on a good that, time after time, slipped from their grasp.