For me, the most exciting aspect of this product is that they don't require attribution[1]. All the other translation services I looked at[2] required the service's name and/or logo to be part of the UI where the call to the translation service is triggered or where translated text is shown. That makes it a non-starter for many use-cases where you don't want to pollute your product with free ad space for someone else (even though you're already paying for the service!)

[1]: https://aws.amazon.com/translate/faqs/

[2]: Google, Microsoft, Yandex