So far all gokv.Storage implementations where for self-hosted open source databases. Some projects have all their infrastructure in AWS and instead of starting and administrating another couple of EC2 instances for a custom database installation they probably prefer to use the database-as-a-service offers by AWS.

There's SimpleDB, for which I'll probably create another issue in the future, but DynamoDB is pushed a lot by AWS and seems to be favored (by AWS at least), so the support, documentation etc. might be better, as well as customer's willingness to adopt it is likely to be higher.

• https://aws.amazon.com/dynamodb/
• https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Introduction.html
• https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.SDKOverview.html
• https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Operations_Amazon_DynamoDB.html
• https://godoc.org/github.com/aws/aws-sdk-go/service/dynamodb