I really doubt the US government would let a Chinese monopoly take the place of Amazon. Tensions are only rising with China right now.
If we’re arguing about power grabs then what happens if China gets more powerful because they have an authoritarian government?
Does that mean the US needs needs to be authoritarian now too? No thanks.
I think that the concern you touched upon is essentially the lose-lose quagmire that we as a country arrived at during the onset of the cold war, a war that I believe never truly ended. To answer your question: the problem with mutually assured destruction doctrine is that it necessarily results in an arms race that no superpower can pull out of. Sadly, I question whether a country can be a superpower without also trending more in the authoritarian direction.