This is not Amazon Dash button, it is a simple proxy/hub tool to allow using multiple Azure storage accounts to allow saving even more data. It currently works with blobs only.
The same concept is used to increase performance of attached drives on Azure, and in that case it is already part of the Windows and Azure platform.
GitHub - MicrosoftDX/Dash: Data At Scale Hub (DASH). Virtual storage account aggregating scale limitations of individual accounts.
"DASH is a solution from Microsoft that allows you to bypass space and I/O limits on Azure Storage. In order to use DASH, you will need to download the source, build the package, and deploy it to Azure."
link from Azure Podcast Episode 144 - DASH