But does it need to be solved perfectly? Change my mind, but I don't believe anybody, garage nerd or small startup, would be affected if they overshot their pla

But does it need to be solved perfectly? Change my mind, but I don't believe anybody, garage nerd or small startup, would be affected if they overshot their planned costs by 10%. I really need a solution when my bill gets by (my) mistake 100x bigger. And I'm convinced AWS could so easily solve this - if they cared to.