Did Amazon (the company) really need this? I don't get it. It feels like bullying for no real purpose.
It could be a defensive thing.
I know from personal experience that carving out a clear online domain name is a lot harder with the expansion of tlds.
Also, I expect phishing sites will have an ever easier time registering convincing domains. So we're going to end up relying on browser blacklisting... not exactly an improvement for security.
They don't, but why not get it if it's available?
I find these new TLDs to be abhorrent, but if they exist, why not own one if you can?