Gleb: Understanding that it's not a CDN per se, would using this primarily for large file distribution (meaning, not images on web sites, etc.) instead of backup be a bad idea?
Should be a fine use case. B2 is fine for backup, but designed to be used for all sorts of storage use cases. Would be happy to have someone on our team explore with you the specifics of your use case (performance, etc.); You can shoot me an email at gleb.budman at backblaze.