The dashboard doesn't load, nor does content using the generic S3 url [1], but we're in us-west-2 and it works fine if you use the region specific URL [2]. In practice this means our site on S3/Cloudfront is unaffected.
[1]: https://s3.amazonaws.com/restocks.io/robots.txt
[2]: https://s3-us-west-2.amazonaws.com/restocks.io/robots.txt