Good post; kinda surprised sshfs is outperforming cifs and makes me need to take a second look at that because, boy, do I ever not like how samba performs, though I'm willing to chalk some of that up to configuration weirdness on my end since I have samba configured to allow any version of Windows that could ever connect to smb/cifs shares to be able to. (Retro computing yay.)
Also, I'd also like to toss in iDrive e2 as a cheap S3 blob storage provider.
I'm paying ~$30 a year for 1tb, with "free" egress. (They operate on the IT'S ON SALE! pricing nonsense so your price will certainly vary because well, it's always on sale, but always different amounts but $30 is the usualish price.)
You get zero useful support, less than the best performance I've ever seen, but it's shockingly cheap and in the last ~2 years (out of the VA datacenter) I've had exactly ONE downtime where it wasn't working, for about three hours.
Good enough to stuff server backups and object storage for a couple of websites.
Oh, and "free" egress means up to 3x the amount you have stored, so it's probably bad if your majority use is going to be public downloads, but if it's not, it'll probably never be an issue; I have like 600gb of backups sitting there so lots of buffer.