So you may - though I'm willing to bet you aren't - ask yourself, why didn't Amazon Technologies, Inc. grab these two domains for the pocket change they cost? If you are, you're thinking the way I'm thinking. But if you aren't, it's possibly because you don't know what they are.
The reality is that Cryptocurrency is a sexy word. While Ethereum isn't a sexy word, it's a fairly successful blockchain technology that specifically using the turing-complete Solidity programming language to create Smart Contracts - stateful executable code that lives in the blockchain. Imagine voting where everyone gets one vote, only the voter with their identifying information can log in and cast their vote, and the voting results are maintained and validated by a wide network of nodes that are nearly incorruptible. So many other possibilities have yet to be considered and realized, but the important point is that Smart Contracts, Amazon. Really? You didn't consult the tech team when you sent the legal intern out to register those domain names did you?