Everyone's interpreting this as AWS is zipping every customer's S3 data and improved storage of their data with ztsd. That's now what Adrian said, and this is not an announcement - this was a "by-the-way" from a retired Amazonian.

AWS switched our own service's log storage (in S3) from gzip to ztsd a bunch of years ago -and reduced storage costs by 30%.

This is AWS's service data (which is still exabytes) and AWS realized the efficiency.

So all the comments of "where is my 30% discount" are offbase.

Source: I've worked on AWS for a bunch of years.