Does anyone have rough numbers on s3 scale? Most storage classes have redundant copies as well so 3x things maybe from that. YouTube / S3 - a few services seem like they must have crazy storage scale
On the AWS scale, object storage servers will probably be filling entire datacenters (or at least an appreciable portion of each datacenter), so it's very easy to see them being well into the exabyte (= million terabyte) scale, though probably not zettabyte (= billion terabyte) yet.
[1] Source: I help maintain an object storage for a private cloud. Disclaimer: These are not the exact numbers for our nodes, but in the same ballpark.