I suspect only EC2/S3 and their paired services (EBS, IAM, etc) gain enough use to qualify as "enormous" and thus receive wide attention for their failings. AWS has a lot of services:

https://en.wikipedia.org/wiki/Amazon_Web_Services#List_of_pr...

Putting that aside, I'm not sure "why aren't people complaining?" is a reasonable way to prove or disprove how buggy software is.