Depends on what exactly you want to do with it. Hetzner has very cheap Storage boxes (10TB for $20/month with unlimited traffic) but those are closer to FTP boxes with a 10 connection limit. They are also down semi-regularly for maintenance.
For rock-solid public hosting Cloudflare is probably a much better bet, but you're also paying 7 times the price. More than a dedicated server to host the files, but you get more on other metrics.
> Hetzner has very cheap Storage boxes (10TB for $20/month with unlimited traffic)
* based on fair use
at 250 TB/mo:
> In order to continue hosting your servers with us, the traffic use will
need to be drastically reduced. Please check your servers and confirm
what is using so much traffic, making sure it is nothing abusive, and
then find ways of reducing it.
Backblaze B2 is only free with Bandwidth Alliance partners, otherwise $0.01/GB, individual transactions will also cost you, depending on how much you use.
That's if you use their CDN. Cloudflare R2 doesn't charge for egress bandwidth. If you have 100TB/mo to serve, try it and see what happens. I haven't heard of anyone being kicked off of R2 for using too much egress bandwidth yet.
At scale, you'll pay a couple thousand dollars for Class B operations on R2, and another bunch for storing the 10 TB in the first place, but that's relatively cheap compared to other offerings where you'd pay for metered egress bandwidth.
CF is not particularly fond of non-Enterprise customers serving more than a few TB/mo. Source: $corp serves 150 TB/mo via CF and pays somewhere north of 50k+/yr for it
The whole point of R2 is to remove predatory practices of egregious charging for egress, and if somehow they went back on this promise that would be a very bad PR.
I don't know about any special offers, but looking at standard pricing on rsync.net it would cost me $15/month for 1TB, while on Hetzner the same would cost me €3.94/month.
For rock-solid public hosting Cloudflare is probably a much better bet, but you're also paying 7 times the price. More than a dedicated server to host the files, but you get more on other metrics.