While I agree with the general sentiment on throwaway compute infra, the generated know-how with large scale experiments is not thrown away. I think a lot hinges on the scaling laws and whether you will hit the jackpot at a certain scale before everyone else. This is hard to guesstimate so someone has to do it in the spirit of empiricism. This might sound a lot like gambling or exploring depending on your sentiment. So, I think it is more justified to criticize the scale and the risks than the spirit of these investments.