[thenewarrakis]

I think the EBS numbers are "double counting". Most of the other services in the list are using EBS under the hood, so I wouldn't be surprised if this number includes stuff like the Aurora instances, CloudTrail events, SQS events, etc that are also included.

Also, it specifically says "incremental capacity allocated", not necessarily used. Keep in mind that every EC2 instance launched also means new EBS storage is allocated. The article also estimates that 50 million EC2 instances were used for Prime Day. If you assume that half of these were newly created to support the surge of Prime Day, 25 million instances using up 160 PB of storage is only 6 gigabytes per instance, which definitely seems in the realm of possibility.