Yev here -> Anyone can write to the B2 Native API or our S3 Compatible API, we have tons of integrations that do it, here's a list -> https://www.backblaze.com/b2/integrations.html
I literally have NEVER seen SFTP being used for blob storage in any python project - is this a real thing somewhere?
It seems to me you would only get a very narrow subset of the functionality.