I know this argument doesn't work well in this example since it's Amazon. But in principle, centralizing data on the internet around a few big services is not a good thing.

These days forums and IRC channels are replaced with Facebook and Discord. An untold amount of code is hosted on GitHub. And now Stack Exchange is the go-to platform for Q&As.

I understand it's convenient and those services have a network effect behind them. But something is lost. Something that made the internet great, where everyone hosted and shared their own content.