I am confused - why is 1Password is using anything but iCloud or Dropbox? Those are the only options I see (and "Folder" which is presumably just local).
They have "for Teams/Families" options now that appear to use a proprietary, server-side sync, instead of the safer guarantees of the traditional client.
It's still very safe. They do not rely on TLS for protection, they actually send already encrypted data over TLS.