iCloud Drive silently deletes your content
A much better reason to not use iCloud Drive is due to the fact that it's not end to end encrypted.  Everything you store in it is readable by Apple sysadmins, support reps, and anyone who can compel them (like the US government can, without a warrant now).<p>Don't use non-e2ee services.<p>(Yes, there is an opt-in e2ee for iCloud now.  No, nobody is using it because it is off by default and buried in settings.)<p>I use syncthing (e2ee, free software) to keep my files on all my machines.  It has sane conflict handling and nice versioning backups.  It even supports untrusted sync-only devices that never see plaintext so you can run a node on a vps or somewhere offsite safely.