I'm not sure what you're arguing? Ethereum is fully decentralized and open source. There happens to be a well funded non-profit that the community funded in order to speed up development (EthDEV). Ethereum and EthDEV are not one in the same thing. If EthDEV disappeared, ethereum would continue. That's a little different than some Amazon owned and operated "AWScoin".

Bitcoin also has the "Bitcoin Foundation" which employs lead developer Gavin Andresen, so it's very similar.