In the past Backblaze has partnered with cloud providers to allow free bandwidth. Backblaze is a well established and respected name in object storage. Object storage has become a standard building block in modern tech stacks. Rather than Fly investing in creating object storage, it might be worth while to at least do network peering with Backblaze, if not outright partner with them to enable object storage on fly.io.
Most other cloud platforms have an object storage that can be accessed without incurring transfer fees. If Fly worked with Backblaze Fly could offer this same benefit to Fly customers.