We’ve seen relays nuke their databases regularly which means users would ultimately rely on the breez relay to store their salt. As a user I personally prefer icloud to store my data longterm indepe...
Oh and users get 2FA for free as an additional security layer when using iCloud/GDrive. Apple even makes users enable 2FA when storing passkeys https://support.apple.com/guide/iphone/use-passkeys-to-sign-in-to-websites-and-apps-iphf538ea8d0/ios