What is the difference between a weather model, a nuclear bomb simulation, and training a LLM?

At the end of the day all these are just calculations, of which you need thousands of processors to do with high accuracy. Pretty much what you're suggesting is a global police force to ensure we're performing the 'correct calculations'. Having to form an authoritarian world computer police isn't much of a solution to the problem either. This just happens to work well in the nuclear world because it's hard to shield and the average person doesn't have a need for uranium.