alt Hacker NewsWorks so great on new devices like smartphones. Except not.
And so easy to set up on a home computer. Except it's not always on and doesn't come with backups.
I'm not saying S3 is where it's at but might need a bit more than just Samba. Or maybe you don't but people who need Dropbox do.
iOS has native support for SMB in the Files app
Turning on SMB is usually just a click of a button, even macOS supports it
Any user technical enough to be able to set up an S3 bucket, Syncthing, Nextcloud or this "Locker" tool from OP can also set up an SMB share
I was responding to the above thread, where sharing files on an offline network is being discussed. Backups were not mentioned as a requirement.