Add Azure
Microsoft Azure https://azure.microsoft.com/ has no regional URLs. All requests go through a single-point-of-failure DNS domain.
I spent 20 minutes trying to find an Azure regional URL and failed. The Blob Store REST API docs are missing critical information like how to specify the region of a container. This is typical crap corporate documentation made by hundreds of different people with nobody taking responsibility for UX.
Apparently, storage accounts are regional. So I would need to create 38 different storage accounts.
Fortunately, it looks like empty accounts are free. I would pay a small fee for each read operation.
In each account, I could create a Blob Store container and configure it for CORS. https://docs.microsoft.com/en-us/rest/api/storageservices/preflight-blob-request .
Pulumi or Terraform would probably be useful for this.