We are self-hosted, I'd _hate_ to think of the costs of hosting this service through AWS or similar who charges for ingress / egress.
We have 5gbps of bandwidth and 12TB of storage that I've dedicated to the service (costing me ~£30/mo, so a fairly trivial sum).
I'm hoping that if we ever exceed 12TB / 5gbps, others will similarly host their own versions of the application. I've heard of half a dozen people already who have just decided to host their own.