I believe the AWS stuff is for their MN hosting service.. can you explain further what AWS stuff you're concerned about?
Amazon is a single US company. In the realm of decentralization to have all the masternodes on one service that can be pressured by the US government is a weakness. Think back to how the gov't stopped paypal and others from allowing contributions to wikileaks.
Will people have the option to run their own nodes ?
You seem to be quite knowledgeable about the project so can you tell me about if there will be KYC with the exchange and what jurisdiction they will be in ?