This is concerning b/c there have been a number of high profile data breaches that have occurred due to over reliance on S3 bucket obscurity. Where the buckets have been left with minimal or misconfigured permissions and GBs of data there for the downloading.
How is this concerning? This is very good, because it makes it easy to do that, which means that's much harder to dismiss as "something that will never happen".
Concerning in the sense of "if you aren't sure why this is a story on HN" -> that you may be unaware that many large and generally technically competent firms are screwing this up and this repo/tool is yet one more reason to take this seriously.
At some point an organization living in the cloud needs to properly secure their cloud resources. This makes it easier to justify that effort up front.
Correct me if I’m wrong but last time I tried to make a new bucket’s contents public it was a real PITA. The default configuration is very locked down. So I think it’s never a case of minimal configuration and always misconfiguration.