Let me put it this way: I can give Amazon zero attention and still know what they are going to do, simply by paying attention elsewhere.
Can you? I suspect you could too. We all can, none of this is a secret.
So…is Amazon a node in the political decision making apparatus if you can ignore them entirely and still predict their behavior? I would argue that is strong evidence Amazon is not a decision node when it comes to political decision making, they are a follower node. I would argue that all mainstream US businesses are follower nodes.
Non-political business questions? Sure. I agree US businesses like Amazon are mostly free to act independently. Shutting down Parler, though, was a political decision. An expression of power. In that realm, Amazon was not the one in charge.