If you want disk, as in spinning rust, I think it's going to remain that way for a long time. For some reason cloud providers don't like to offer disk at a reasonable price. I suspect it might be because it's not actually a single disk but space on something like a RAID10 SAN, where costs are higher since it inherently requires more hardware.
Personally, I settled with colocation. I pay $60/mo + $2k one-off for the initial hardware + say $150/5y/4TB HDD, which, for 80TB of storage over 5y comes out to a total of ~$88/mo, or $0.001/GBmo. Even if I was to store 3 copies of everything instead of doing erasure coding, my costs are roughly half of what Backblaze B2 charges. And my disks are fully online block storage, not necessarily object storage.
Personally, I settled with colocation. I pay $60/mo + $2k one-off for the initial hardware + say $150/5y/4TB HDD, which, for 80TB of storage over 5y comes out to a total of ~$88/mo, or $0.001/GBmo. Even if I was to store 3 copies of everything instead of doing erasure coding, my costs are roughly half of what Backblaze B2 charges. And my disks are fully online block storage, not necessarily object storage.