Is Cloud Sync more private than iCloud or Google Drive sync?

Cloud Sync is always end-to-end encrypted: each device's copy is encrypted on the device with a key only your devices have, so WitnessWork's server stores data it can't read. The server sees things like your anonymous account, how many of its devices sync, and the size and time of each copy, never what's in it. iCloud and Google Drive sync store a copy in your iCloud Drive or a hidden folder of your Google Drive. Apple and Google protect it, and Apple encrypts it end to end if you turned on Advanced Data Protection, but WitnessWork doesn't encrypt iCloud or Google Drive sync end to end itself. If you lose every device and your recovery key, Cloud Sync's copies can't be read by anyone, including us.