FTP to Azure Blob Storage

Question

I had to setup secure FTP to Azure Blob Storage using popular FTP clients (like FileZilla, for example). After doing lot of research, I came across a link that says:

Answer 1

But why?

There are already two very good FTP-style Azure Storage clients out there:
http://storageexplorer.com and http://azurestorageexplorer.codeplex.com

Both of them, as @Guarav well pointed out, can use a Shared Access Signature (SAS) to connect to Azure Storage without exposing the account key. You can then use a different SAS for each customer, if you're building a multi-tenant service - although if you think about it - that's not a very sound separation boundary.

I would use a separate storage account for every customer. That way if a storage account gets compromised, it only affects one customer. The following limit applies:

From https://azure.microsoft.com/en-us/documentation/articles/storage-scalability-targets/:

Scalability targets for blobs, queues, tables, and files

Number of storage accounts per subscription: 200

This includes both Standard and Premium storage accounts. If you require more than 200 storage accounts, make a request through Azure Support. The Azure Storage team will review your business case and may approve up to 250 storage accounts.